Summary: Methods | Protected Methods | Inherited Methods | [Expand All]

public final class

BehaviorSubject

extends Subject<T>

java.lang.Object
↳	io.reactivex.Observable<T>
	↳	io.reactivex.subjects.Subject<T>
		↳	io.reactivex.subjects.BehaviorSubject<T>

Class Overview

Subject that emits the most recent item it has observed and all subsequent observed items to each subscribed Observer.

Example usage:

 // observer will receive all 4 events (including "default").
  BehaviorSubject<Object> subject = BehaviorSubject.createDefault("default");
  subject.subscribe(observer);
  subject.onNext("one");
  subject.onNext("two");
  subject.onNext("three");

  // observer will receive the "one", "two" and "three" events, but not "zero"
  BehaviorSubject<Object> subject = BehaviorSubject.create();
  subject.onNext("zero");
  subject.onNext("one");
  subject.subscribe(observer);
  subject.onNext("two");
  subject.onNext("three");

  // observer will receive only onComplete
  BehaviorSubject<Object> subject = BehaviorSubject.create();
  subject.onNext("zero");
  subject.onNext("one");
  subject.onComplete();
  subject.subscribe(observer);

  // observer will receive only onError
  BehaviorSubject<Object> subject = BehaviorSubject.create();
  subject.onNext("zero");
  subject.onNext("one");
  subject.onError(new RuntimeException("error"));
  subject.subscribe(observer);

Summary

Public Methods
static <T> BehaviorSubject<T>	create() Creates a `BehaviorSubject` without a default item.
static <T> BehaviorSubject<T>	createDefault(T defaultValue) Creates a `BehaviorSubject` that emits the last item it observed and all subsequent items to each `Observer` that subscribes to it.
Throwable	getThrowable() Returns the error that caused the Subject to terminate or null if the Subject hasn't terminated yet.
T	getValue() Returns a single value the Subject currently has or null if no such value exists.
T[]	getValues(T[] array) Returns a typed array containing a snapshot of all values of the Subject.
Object[]	getValues() Returns an Object array containing snapshot all values of the Subject.
boolean	hasComplete() Returns true if the subject has reached a terminal state through a complete event.
boolean	hasObservers() Returns true if the subject has any Observers.
boolean	hasThrowable() Returns true if the subject has reached a terminal state through an error event.
boolean	hasValue() Returns true if the subject has any value.
void	onComplete()
void	onError(Throwable t)
void	onNext(T t)
void	onSubscribe(Disposable s)

Protected Methods
void	subscribeActual(Observer<? super T> observer) Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.

[Expand]

Inherited Methods

From class io.reactivex.subjects.Subject

From class io.reactivex.Observable

final Single<Boolean>	all(Predicate<? super T> predicate) Returns an Observable that emits a Boolean that indicates whether all of the items emitted by the source ObservableSource satisfy a condition.
static <T> Observable<T>	amb(Iterable<? extends ObservableSource<? extends T>> sources) Mirrors the one ObservableSource in an Iterable of several ObservableSources that first either emits an item or sends a termination notification.
static <T> Observable<T>	ambArray(ObservableSource...<? extends T> sources) Mirrors the one ObservableSource in an array of several ObservableSources that first either emits an item or sends a termination notification.
final Observable<T>	ambWith(ObservableSource<? extends T> other) Mirrors the ObservableSource (current or provided) that first either emits an item or sends a termination notification.
final Single<Boolean>	any(Predicate<? super T> predicate) Returns an Observable that emits `true` if any item emitted by the source ObservableSource satisfies a specified condition, otherwise `false`.
final T	blockingFirst(T defaultItem) Returns the first item emitted by this `Observable`, or a default value if it emits no items.
final T	blockingFirst() Returns the first item emitted by this `Observable`, or throws `NoSuchElementException` if it emits no items.
final void	blockingForEach(Consumer<? super T> onNext) Invokes a method on each item emitted by this `Observable` and blocks until the Observable completes.
final Iterable<T>	blockingIterable(int bufferSize) Converts this `Observable` into an `Iterable`.
final Iterable<T>	blockingIterable() Converts this `Observable` into an `Iterable`.
final T	blockingLast() Returns the last item emitted by this `Observable`, or throws `NoSuchElementException` if this `Observable` emits no items.
final T	blockingLast(T defaultItem) Returns the last item emitted by this `Observable`, or a default value if it emits no items.
final Iterable<T>	blockingLatest() Returns an `Iterable` that returns the latest item emitted by this `Observable`, waiting if necessary for one to become available.
final Iterable<T>	blockingMostRecent(T initialValue) Returns an `Iterable` that always returns the item most recently emitted by this `Observable`.
final Iterable<T>	blockingNext() Returns an `Iterable` that blocks until this `Observable` emits another item, then returns that item.
final T	blockingSingle(T defaultItem) If this `Observable` completes after emitting a single item, return that item; if it emits more than one item, throw an `IllegalArgumentException`; if it emits no items, return a default value.
final T	blockingSingle() If this `Observable` completes after emitting a single item, return that item, otherwise throw a `NoSuchElementException`.
final void	blockingSubscribe(Consumer<? super T> onNext) Subscribes to the source and calls the given callbacks on the current thread.
final void	blockingSubscribe(Observer<? super T> subscriber) Subscribes to the source and calls the Observer methods on the current thread.
final void	blockingSubscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError) Subscribes to the source and calls the given callbacks on the current thread.
final void	blockingSubscribe() Runs the source observable to a terminal event, ignoring any values and rethrowing any exception.
final void	blockingSubscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete) Subscribes to the source and calls the given callbacks on the current thread.
final <TOpening, TClosing> Observable<List<T>>	buffer(ObservableSource<? extends TOpening> openingIndicator, Function<? super TOpening, ? extends ObservableSource<? extends TClosing>> closingIndicator) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <TOpening, TClosing, U extends Collection<? super T>> Observable<U>	buffer(ObservableSource<? extends TOpening> openingIndicator, Function<? super TOpening, ? extends ObservableSource<? extends TClosing>> closingIndicator, Callable<U> bufferSupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <U extends Collection<? super T>> Observable<U>	buffer(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, Callable<U> bufferSupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final Observable<List<T>>	buffer(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <U extends Collection<? super T>> Observable<U>	buffer(int count, Callable<U> bufferSupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <B, U extends Collection<? super T>> Observable<U>	buffer(Callable<? extends ObservableSource<B>> boundarySupplier, Callable<U> bufferSupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final Observable<List<T>>	buffer(long timespan, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <B> Observable<List<T>>	buffer(ObservableSource<B> boundary, int initialCapacity) Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the specified boundary ObservableSource emits an item.
final Observable<List<T>>	buffer(int count) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <B> Observable<List<T>>	buffer(Callable<? extends ObservableSource<B>> boundarySupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <B> Observable<List<T>>	buffer(ObservableSource<B> boundary) Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the specified boundary ObservableSource emits an item.
final Observable<List<T>>	buffer(long timespan, long timeskip, TimeUnit unit) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final Observable<List<T>>	buffer(long timespan, TimeUnit unit, Scheduler scheduler, int count) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final Observable<List<T>>	buffer(long timespan, TimeUnit unit) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <U extends Collection<? super T>> Observable<U>	buffer(long timespan, TimeUnit unit, Scheduler scheduler, int count, Callable<U> bufferSupplier, boolean restartTimerOnMaxSize) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <B, U extends Collection<? super T>> Observable<U>	buffer(ObservableSource<B> boundary, Callable<U> bufferSupplier) Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the specified boundary ObservableSource emits an item.
final Observable<List<T>>	buffer(int count, int skip) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final Observable<List<T>>	buffer(long timespan, TimeUnit unit, int count) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
final <U extends Collection<? super T>> Observable<U>	buffer(int count, int skip, Callable<U> bufferSupplier) Returns an Observable that emits buffers of items it collects from the source ObservableSource.
static int	bufferSize() Returns the default 'island' size or capacity-increment hint for unbounded buffers.
final Observable<T>	cache() Returns an Observable that subscribes to this ObservableSource lazily, caches all of its events and replays them, in the same order as received, to all the downstream subscribers.
final Observable<T>	cacheWithInitialCapacity(int initialCapacity) Returns an Observable that subscribes to this ObservableSource lazily, caches all of its events and replays them, in the same order as received, to all the downstream subscribers.
final <U> Observable<U>	cast(Class<U> clazz) Returns an Observable that emits the items emitted by the source ObservableSource, converted to the specified type.
final <U> Single<U>	collect(Callable<? extends U> initialValueSupplier, BiConsumer<? super U, ? super T> collector) Collects items emitted by the source ObservableSource into a single mutable data structure and returns a Single that emits this structure.
final <U> Single<U>	collectInto(U initialValue, BiConsumer<? super U, ? super T> collector) Collects items emitted by the source ObservableSource into a single mutable data structure and returns a Single that emits this structure.
static <T1, T2, T3, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, Function3<? super T1, ? super T2, ? super T3, ? extends R> combiner) Combines three source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> combiner) Combines eight source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatest(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> combiner, int bufferSize) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatest(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> combiner) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, T5, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> combiner) Combines five source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, BiFunction<? super T1, ? super T2, ? extends R> combiner) Combines two source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from either of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> combiner) Combines four source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatest(ObservableSource[]<? extends T> sources, Function<? super Object[], ? extends R> combiner) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> combiner) Combines seven source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatest(ObservableSource[]<? extends T> sources, Function<? super Object[], ? extends R> combiner, int bufferSize) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, T5, T6, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> combiner) Combines six source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatest(Function<? super Object[], ? extends R> combiner, int bufferSize, ObservableSource...<? extends T> sources) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R>	combineLatest(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, ObservableSource<? extends T9> source9, Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> combiner) Combines nine source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
static <T, R> Observable<R>	combineLatestDelayError(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> combiner, int bufferSize) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function and delays any error from the sources until all source ObservableSources terminate.
static <T, R> Observable<R>	combineLatestDelayError(Function<? super Object[], ? extends R> combiner, int bufferSize, ObservableSource...<? extends T> sources) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function and delays any error from the sources until all source ObservableSources terminate.
static <T, R> Observable<R>	combineLatestDelayError(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> combiner) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function and delays any error from the sources until all source ObservableSources terminate.
static <T, R> Observable<R>	combineLatestDelayError(ObservableSource[]<? extends T> sources, Function<? super Object[], ? extends R> combiner, int bufferSize) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function and delays any error from the sources until all source ObservableSources terminate.
static <T, R> Observable<R>	combineLatestDelayError(ObservableSource[]<? extends T> sources, Function<? super Object[], ? extends R> combiner) Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of the source ObservableSources each time an item is received from any of the source ObservableSources, where this aggregation is defined by a specified function.
final <R> Observable<R>	compose(ObservableTransformer<? super T, ? extends R> composer) Transform an ObservableSource by applying a particular Transformer function to it.
static <T> Observable<T>	concat(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) Returns an Observable that emits the items emitted by three ObservableSources, one after the other, without interleaving them.
static <T> Observable<T>	concat(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) Returns an Observable that emits the items emitted by each of the ObservableSources emitted by the source ObservableSource, one after the other, without interleaving them.
static <T> Observable<T>	concat(ObservableSource<? extends ObservableSource<? extends T>> sources) Returns an Observable that emits the items emitted by each of the ObservableSources emitted by the source ObservableSource, one after the other, without interleaving them.
static <T> Observable<T>	concat(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) Returns an Observable that emits the items emitted by two ObservableSources, one after the other, without interleaving them.
static <T> Observable<T>	concat(Iterable<? extends ObservableSource<? extends T>> sources) Concatenates elements of each ObservableSource provided via an Iterable sequence into a single sequence of elements without interleaving them.
static <T> Observable<T>	concat(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) Returns an Observable that emits the items emitted by four ObservableSources, one after the other, without interleaving them.
static <T> Observable<T>	concatArray(ObservableSource...<? extends T> sources) Concatenates a variable number of ObservableSource sources.
static <T> Observable<T>	concatArrayDelayError(ObservableSource...<? extends T> sources) Concatenates a variable number of ObservableSource sources and delays errors from any of them till all terminate.
static <T> Observable<T>	concatArrayEager(ObservableSource...<? extends T> sources) Concatenates a sequence of ObservableSources eagerly into a single stream of values.
static <T> Observable<T>	concatArrayEager(int maxConcurrency, int prefetch, ObservableSource...<? extends T> sources) Concatenates a sequence of ObservableSources eagerly into a single stream of values.
static <T> Observable<T>	concatDelayError(Iterable<? extends ObservableSource<? extends T>> sources) Concatenates the Iterable sequence of ObservableSources into a single sequence by subscribing to each ObservableSource, one after the other, one at a time and delays any errors till the all inner ObservableSources terminate.
static <T> Observable<T>	concatDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch, boolean tillTheEnd) Concatenates the ObservableSource sequence of ObservableSources into a single sequence by subscribing to each inner ObservableSource, one after the other, one at a time and delays any errors till the all inner and the outer ObservableSources terminate.
static <T> Observable<T>	concatDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) Concatenates the ObservableSource sequence of ObservableSources into a single sequence by subscribing to each inner ObservableSource, one after the other, one at a time and delays any errors till the all inner and the outer ObservableSources terminate.
static <T> Observable<T>	concatEager(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int prefetch) Concatenates an ObservableSource sequence of ObservableSources eagerly into a single stream of values.
static <T> Observable<T>	concatEager(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int prefetch) Concatenates a sequence of ObservableSources eagerly into a single stream of values.
static <T> Observable<T>	concatEager(Iterable<? extends ObservableSource<? extends T>> sources) Concatenates a sequence of ObservableSources eagerly into a single stream of values.
static <T> Observable<T>	concatEager(ObservableSource<? extends ObservableSource<? extends T>> sources) Concatenates an ObservableSource sequence of ObservableSources eagerly into a single stream of values.
final <R> Observable<R>	concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int prefetch) Returns a new Observable that emits items resulting from applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then emitting the items that result from concatenating those resulting ObservableSources.
final <R> Observable<R>	concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Returns a new Observable that emits items resulting from applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then emitting the items that result from concatenating those resulting ObservableSources.
final <R> Observable<R>	concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Maps each of the items into an ObservableSource, subscribes to them one after the other, one at a time and emits their values in order while delaying any error from either this or any of the inner ObservableSources till all of them terminate.
final <R> Observable<R>	concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int prefetch, boolean tillTheEnd) Maps each of the items into an ObservableSource, subscribes to them one after the other, one at a time and emits their values in order while delaying any error from either this or any of the inner ObservableSources till all of them terminate.
final <R> Observable<R>	concatMapEager(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single ObservableSource.
final <R> Observable<R>	concatMapEager(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int maxConcurrency, int prefetch) Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single ObservableSource.
final <R> Observable<R>	concatMapEagerDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean tillTheEnd) Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single ObservableSource.
final <R> Observable<R>	concatMapEagerDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int maxConcurrency, int prefetch, boolean tillTheEnd) Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single ObservableSource.
final <U> Observable<U>	concatMapIterable(Function<? super T, ? extends Iterable<? extends U>> mapper) Returns an Observable that concatenate each item emitted by the source ObservableSource with the values in an Iterable corresponding to that item that is generated by a selector.
final <U> Observable<U>	concatMapIterable(Function<? super T, ? extends Iterable<? extends U>> mapper, int prefetch) Returns an Observable that concatenate each item emitted by the source ObservableSource with the values in an Iterable corresponding to that item that is generated by a selector.
final Observable<T>	concatWith(ObservableSource<? extends T> other) Returns an Observable that emits the items emitted from the current ObservableSource, then the next, one after the other, without interleaving them.
final Single<Boolean>	contains(Object element) Returns an Observable that emits a Boolean that indicates whether the source ObservableSource emitted a specified item.
final Single<Long>	count() Returns a Single that counts the total number of items emitted by the source ObservableSource and emits this count as a 64-bit Long.
static <T> Observable<T>	create(ObservableOnSubscribe<T> source) Provides an API (via a cold Observable) that bridges the reactive world with the callback-style world.
final Observable<T>	debounce(long timeout, TimeUnit unit) Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the source ObservableSource that are followed by newer items before a timeout value expires.
final Observable<T>	debounce(long timeout, TimeUnit unit, Scheduler scheduler) Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the source ObservableSource that are followed by newer items before a timeout value expires on a specified Scheduler.
final <U> Observable<T>	debounce(Function<? super T, ? extends ObservableSource<U>> debounceSelector) Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the source ObservableSource that are followed by another item within a computed debounce duration.
final Observable<T>	defaultIfEmpty(T defaultItem) Returns an Observable that emits the items emitted by the source ObservableSource or a specified default item if the source ObservableSource is empty.
static <T> Observable<T>	defer(Callable<? extends ObservableSource<? extends T>> supplier) Returns an Observable that calls an ObservableSource factory to create an ObservableSource for each new Observer that subscribes.
final Observable<T>	delay(long delay, TimeUnit unit, boolean delayError) Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a specified delay.
final Observable<T>	delay(long delay, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a specified delay.
final Observable<T>	delay(long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a specified delay.
final <U> Observable<T>	delay(Function<? super T, ? extends ObservableSource<U>> itemDelay) Returns an Observable that delays the emissions of the source ObservableSource via another ObservableSource on a per-item basis.
final <U, V> Observable<T>	delay(ObservableSource<U> subscriptionDelay, Function<? super T, ? extends ObservableSource<V>> itemDelay) Returns an Observable that delays the subscription to and emissions from the source ObservableSource via another ObservableSource on a per-item basis.
final Observable<T>	delay(long delay, TimeUnit unit) Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a specified delay.
final Observable<T>	delaySubscription(long delay, TimeUnit unit, Scheduler scheduler) Returns an Observable that delays the subscription to the source ObservableSource by a given amount of time, both waiting and subscribing on a given Scheduler.
final Observable<T>	delaySubscription(long delay, TimeUnit unit) Returns an Observable that delays the subscription to the source ObservableSource by a given amount of time.
final <U> Observable<T>	delaySubscription(ObservableSource<U> other) Returns an Observable that delays the subscription to this Observable until the other Observable emits an element or completes normally.
final <T2> Observable<T2>	dematerialize() Returns an Observable that reverses the effect of `materialize` by transforming the `Notification` objects emitted by the source ObservableSource into the items or notifications they represent.
final Observable<T>	distinct() Returns an Observable that emits all items emitted by the source ObservableSource that are distinct.
final <K> Observable<T>	distinct(Function<? super T, K> keySelector) Returns an Observable that emits all items emitted by the source ObservableSource that are distinct according to a key selector function.
final <K> Observable<T>	distinct(Function<? super T, K> keySelector, Callable<? extends Collection<? super K>> collectionSupplier) Returns an Observable that emits all items emitted by the source ObservableSource that are distinct according to a key selector function.
final Observable<T>	distinctUntilChanged(BiPredicate<? super T, ? super T> comparer) Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their immediate predecessors when compared with each other via the provided comparator function.
final <K> Observable<T>	distinctUntilChanged(Function<? super T, K> keySelector) Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their immediate predecessors, according to a key selector function.
final Observable<T>	distinctUntilChanged() Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their immediate predecessors.
final Observable<T>	doAfterNext(Consumer<? super T> onAfterNext) Calls the specified consumer with the current item after this item has been emitted to the downstream.
final Observable<T>	doAfterTerminate(Action onFinally) Registers an `Action` to be called when this ObservableSource invokes either `onComplete` or `onError`.
final Observable<T>	doFinally(Action onFinally) Calls the specified action after this Observable signals onError or onCompleted or gets disposed by the downstream.
final Observable<T>	doOnComplete(Action onComplete) Modifies the source ObservableSource so that it invokes an action when it calls `onComplete`.
final Observable<T>	doOnDispose(Action onDispose) Calls the dispose `Action` if the downstream disposes the sequence.
final Observable<T>	doOnEach(Observer<? super T> observer) Modifies the source ObservableSource so that it notifies an Observer for each item and terminal event it emits.
final Observable<T>	doOnEach(Consumer<? super Notification<T>> onNotification) Modifies the source ObservableSource so that it invokes an action for each item it emits.
final Observable<T>	doOnError(Consumer<? super Throwable> onError) Modifies the source ObservableSource so that it invokes an action if it calls `onError`.
final Observable<T>	doOnLifecycle(Consumer<? super Disposable> onSubscribe, Action onDispose) Calls the appropriate onXXX method (shared between all Observer) for the lifecycle events of the sequence (subscription, cancellation, requesting).
final Observable<T>	doOnNext(Consumer<? super T> onNext) Modifies the source ObservableSource so that it invokes an action when it calls `onNext`.
final Observable<T>	doOnSubscribe(Consumer<? super Disposable> onSubscribe) Modifies the source `ObservableSource` so that it invokes the given action when it is subscribed from its subscribers.
final Observable<T>	doOnTerminate(Action onTerminate) Modifies the source ObservableSource so that it invokes an action when it calls `onComplete` or `onError`.
final Single<T>	elementAt(long index, T defaultItem) Returns a Single that emits the item found at a specified index in a sequence of emissions from this Observable, or a default item if that index is out of range.
final Maybe<T>	elementAt(long index) Returns a Maybe that emits the single item at a specified index in a sequence of emissions from this Observable or completes if this Observable signals fewer elements than index.
final Single<T>	elementAtOrError(long index) Returns a Single that emits the item found at a specified index in a sequence of emissions from this Observable or signals a `NoSuchElementException` if this Observable signals fewer elements than index.
static <T> Observable<T>	empty() Returns an Observable that emits no items to the `Observer` and immediately invokes its `onComplete` method.
static <T> Observable<T>	error(Callable<? extends Throwable> errorSupplier) Returns an Observable that invokes an `Observer`'s `onError` method when the Observer subscribes to it.
static <T> Observable<T>	error(Throwable exception) Returns an Observable that invokes an `Observer`'s `onError` method when the Observer subscribes to it.
final Observable<T>	filter(Predicate<? super T> predicate) Filters items emitted by an ObservableSource by only emitting those that satisfy a specified predicate.
final Single<T>	first(T defaultItem) Returns a Single that emits only the very first item emitted by the source ObservableSource, or a default item if the source ObservableSource completes without emitting any items.
final Maybe<T>	firstElement() Returns a Maybe that emits only the very first item emitted by the source ObservableSource, or completes if the source ObservableSource is empty.
final Single<T>	firstOrError() Returns a Single that emits only the very first item emitted by this Observable or signals a `NoSuchElementException` if this Observable is empty.
final <U, R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency, int bufferSize) Returns an Observable that emits the results of a specified function to the pair of values emitted by the source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting ObservableSources and emitting the results of this merger.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> onNextMapper, Function<Throwable, ? extends ObservableSource<? extends R>> onErrorMapper, Callable<? extends ObservableSource<? extends R>> onCompleteSupplier, int maxConcurrency) Returns an Observable that applies a function to each item emitted or notification raised by the source ObservableSource and then flattens the ObservableSources returned from these functions and emits the resulting items, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <U, R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends R> combiner, int maxConcurrency) Returns an Observable that emits the results of a specified function to the pair of values emitted by the source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean delayErrors) Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting ObservableSources and emitting the results of this merger.
final <U, R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors) Returns an Observable that emits the results of a specified function to the pair of values emitted by the source ObservableSource and a specified collection ObservableSource.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> onNextMapper, Function<? super Throwable, ? extends ObservableSource<? extends R>> onErrorMapper, Callable<? extends ObservableSource<? extends R>> onCompleteSupplier) Returns an Observable that applies a function to each item emitted or notification raised by the source ObservableSource and then flattens the ObservableSources returned from these functions and emits the resulting items.
final <U, R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency) Returns an Observable that emits the results of a specified function to the pair of values emitted by the source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean delayErrors, int maxConcurrency, int bufferSize) Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean delayErrors, int maxConcurrency) Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int maxConcurrency) Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
final <U, R> Observable<R>	flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends R> resultSelector) Returns an Observable that emits the results of a specified function to the pair of values emitted by the source ObservableSource and a specified collection ObservableSource.
final Completable	flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors) Maps each element of the upstream Observable into CompletableSources, subscribes to them and waits until the upstream and all CompletableSources complete, optionally delaying all errors.
final Completable	flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper) Maps each element of the upstream Observable into CompletableSources, subscribes to them and waits until the upstream and all CompletableSources complete.
final <U, V> Observable<V>	flatMapIterable(Function<? super T, ? extends Iterable<? extends U>> mapper, BiFunction<? super T, ? super U, ? extends V> resultSelector) Returns an Observable that emits the results of applying a function to the pair of values from the source ObservableSource and an Iterable corresponding to that item that is generated by a selector.
final <U> Observable<U>	flatMapIterable(Function<? super T, ? extends Iterable<? extends U>> mapper) Returns an Observable that merges each item emitted by the source ObservableSource with the values in an Iterable corresponding to that item that is generated by a selector.
final <R> Observable<R>	flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean delayErrors) Maps each element of the upstream Observable into MaybeSources, subscribes to them and waits until the upstream and all MaybeSources complete, optionally delaying all errors.
final <R> Observable<R>	flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper) Maps each element of the upstream Observable into MaybeSources, subscribes to them and waits until the upstream and all MaybeSources complete.
final <R> Observable<R>	flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper) Maps each element of the upstream Observable into SingleSources, subscribes to them and waits until the upstream and all SingleSources complete.
final <R> Observable<R>	flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean delayErrors) Maps each element of the upstream Observable into SingleSources, subscribes to them and waits until the upstream and all SingleSources complete, optionally delaying all errors.
final Disposable	forEach(Consumer<? super T> onNext) Subscribes to the `ObservableSource` and receives notifications for each element.
final Disposable	forEachWhile(Predicate<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete) Subscribes to the `ObservableSource` and receives notifications for each element and the terminal events until the onNext Predicate returns false.
final Disposable	forEachWhile(Predicate<? super T> onNext, Consumer<? super Throwable> onError) Subscribes to the `ObservableSource` and receives notifications for each element and error events until the onNext Predicate returns false.
final Disposable	forEachWhile(Predicate<? super T> onNext) Subscribes to the `ObservableSource` and receives notifications for each element until the onNext Predicate returns false.
static <T> Observable<T>	fromArray(T... items) Converts an Array into an ObservableSource that emits the items in the Array.
static <T> Observable<T>	fromCallable(Callable<? extends T> supplier) Returns an Observable that, when an observer subscribes to it, invokes a function you specify and then emits the value returned from that function.
static <T> Observable<T>	fromFuture(Future<? extends T> future, Scheduler scheduler) Converts a `Future`, operating on a specified `Scheduler`, into an ObservableSource.
static <T> Observable<T>	fromFuture(Future<? extends T> future, long timeout, TimeUnit unit, Scheduler scheduler) Converts a `Future` into an ObservableSource, with a timeout on the Future.
static <T> Observable<T>	fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) Converts a `Future` into an ObservableSource, with a timeout on the Future.
static <T> Observable<T>	fromFuture(Future<? extends T> future) Converts a `Future` into an ObservableSource.
static <T> Observable<T>	fromIterable(Iterable<? extends T> source) Converts an `Iterable` sequence into an ObservableSource that emits the items in the sequence.
static <T> Observable<T>	fromPublisher(Publisher<? extends T> publisher) Converts an arbitrary Reactive-Streams Publisher into an Observable.
static <T, S> Observable<T>	generate(Callable<S> initialState, BiFunction<S, Emitter<T>, S> generator, Consumer<? super S> disposeState) Returns a cold, synchronous and stateful generator of values.
static <T, S> Observable<T>	generate(Callable<S> initialState, BiFunction<S, Emitter<T>, S> generator) Returns a cold, synchronous and stateful generator of values.
static <T, S> Observable<T>	generate(Callable<S> initialState, BiConsumer<S, Emitter<T>> generator) Returns a cold, synchronous and stateful generator of values.
static <T, S> Observable<T>	generate(Callable<S> initialState, BiConsumer<S, Emitter<T>> generator, Consumer<? super S> disposeState) Returns a cold, synchronous and stateful generator of values.
static <T> Observable<T>	generate(Consumer<Emitter<T>> generator) Returns a cold, synchronous and stateless generator of values.
final <K> Observable<GroupedObservable<K, T>>	groupBy(Function<? super T, ? extends K> keySelector, boolean delayError) Groups the items emitted by an `ObservableSource` according to a specified criterion, and emits these grouped items as `GroupedObservable`s.
final <K> Observable<GroupedObservable<K, T>>	groupBy(Function<? super T, ? extends K> keySelector) Groups the items emitted by an `ObservableSource` according to a specified criterion, and emits these grouped items as `GroupedObservable`s.
final <K, V> Observable<GroupedObservable<K, V>>	groupBy(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector) Groups the items emitted by an `ObservableSource` according to a specified criterion, and emits these grouped items as `GroupedObservable`s.
final <K, V> Observable<GroupedObservable<K, V>>	groupBy(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector, boolean delayError) Groups the items emitted by an `ObservableSource` according to a specified criterion, and emits these grouped items as `GroupedObservable`s.
final <K, V> Observable<GroupedObservable<K, V>>	groupBy(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector, boolean delayError, int bufferSize) Groups the items emitted by an `ObservableSource` according to a specified criterion, and emits these grouped items as `GroupedObservable`s.
final <TRight, TLeftEnd, TRightEnd, R> Observable<R>	groupJoin(ObservableSource<? extends TRight> other, Function<? super T, ? extends ObservableSource<TLeftEnd>> leftEnd, Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd, BiFunction<? super T, ? super Observable<TRight>, ? extends R> resultSelector) Returns an Observable that correlates two ObservableSources when they overlap in time and groups the results.
final Observable<T>	hide() Hides the identity of this Observable and its Disposable.
final Completable	ignoreElements() Ignores all items emitted by the source ObservableSource and only calls `onComplete` or `onError`.
static Observable<Long>	interval(long period, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits a sequential number every specified interval of time, on a specified Scheduler.
static Observable<Long>	interval(long period, TimeUnit unit) Returns an Observable that emits a sequential number every specified interval of time.
static Observable<Long>	interval(long initialDelay, long period, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits a `0L` after the `initialDelay` and ever increasing numbers after each `period` of time thereafter, on a specified `Scheduler`.
static Observable<Long>	interval(long initialDelay, long period, TimeUnit unit) Returns an Observable that emits a `0L` after the `initialDelay` and ever increasing numbers after each `period` of time thereafter.
static Observable<Long>	intervalRange(long start, long count, long initialDelay, long period, TimeUnit unit, Scheduler scheduler) Signals a range of long values, the first after some initial delay and the rest periodically after.
static Observable<Long>	intervalRange(long start, long count, long initialDelay, long period, TimeUnit unit) Signals a range of long values, the first after some initial delay and the rest periodically after.
final Single<Boolean>	isEmpty() Returns an Observable that emits `true` if the source ObservableSource is empty, otherwise `false`.
final <TRight, TLeftEnd, TRightEnd, R> Observable<R>	join(ObservableSource<? extends TRight> other, Function<? super T, ? extends ObservableSource<TLeftEnd>> leftEnd, Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd, BiFunction<? super T, ? super TRight, ? extends R> resultSelector) Correlates the items emitted by two ObservableSources based on overlapping durations.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5, T item6) Converts six items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2) Converts two items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4) Converts four items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item) Returns an Observable that emits a single item and then completes.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5) Converts five items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5, T item6, T item7) Converts seven items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8) Converts eight items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9) Converts nine items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9, T item10) Converts ten items into an ObservableSource that emits those items.
static <T> Observable<T>	just(T item1, T item2, T item3) Converts three items into an ObservableSource that emits those items.
final Single<T>	last(T defaultItem) Returns a Single that emits only the last item emitted by this Observable, or a default item if this Observable completes without emitting any items.
final Maybe<T>	lastElement() Returns a Maybe that emits the last item emitted by this Observable or completes if this Observable is empty.
final Single<T>	lastOrError() Returns a Single that emits only the last item emitted by this Observable or signals a `NoSuchElementException` if this Observable is empty.
final <R> Observable<R>	lift(ObservableOperator<? extends R, ? super T> lifter) This method requires advanced knowledge about building operators; please consider other standard composition methods first; Lifts a function to the current ObservableSource and returns a new ObservableSource that when subscribed to will pass the values of the current ObservableSource through the Operator function.
final <R> Observable<R>	map(Function<? super T, ? extends R> mapper) Returns an Observable that applies a specified function to each item emitted by the source ObservableSource and emits the results of these function applications.
final Observable<Notification<T>>	materialize() Returns an Observable that represents all of the emissions and notifications from the source ObservableSource into emissions marked with their original types within `Notification` objects.
static <T> Observable<T>	merge(Iterable<? extends ObservableSource<? extends T>> sources) Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation.
static <T> Observable<T>	merge(ObservableSource<? extends ObservableSource<? extends T>> sources) Flattens an ObservableSource that emits ObservableSources into a single ObservableSource that emits the items emitted by those ObservableSources, without any transformation.
static <T> Observable<T>	merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) Flattens two ObservableSources into a single ObservableSource, without any transformation.
static <T> Observable<T>	merge(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int bufferSize) Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	merge(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency) Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) Flattens three ObservableSources into a single ObservableSource, without any transformation.
static <T> Observable<T>	merge(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) Flattens an ObservableSource that emits ObservableSources into a single ObservableSource that emits the items emitted by those ObservableSources, without any transformation, while limiting the maximum number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) Flattens four ObservableSources into a single ObservableSource, without any transformation.
static <T> Observable<T>	mergeArray(int maxConcurrency, int bufferSize, ObservableSource...<? extends T> sources) Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	mergeArray(ObservableSource...<? extends T> sources) Flattens an Array of ObservableSources into one ObservableSource, without any transformation.
static <T> Observable<T>	mergeArrayDelayError(ObservableSource...<? extends T> sources) Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeArrayDelayError(int maxConcurrency, int bufferSize, ObservableSource...<? extends T> sources) Flattens an array of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) Flattens four ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from all of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources) Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) Flattens two ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) Flattens three ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from all of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) Flattens an ObservableSource that emits ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from all of the source ObservableSources without being interrupted by an error notification from one of them.
static <T> Observable<T>	mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int bufferSize) Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency) Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from each of the source ObservableSources without being interrupted by an error notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
static <T> Observable<T>	mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) Flattens an ObservableSource that emits ObservableSources into one ObservableSource, in a way that allows an Observer to receive all successfully emitted items from all of the source ObservableSources without being interrupted by an error notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
final Observable<T>	mergeWith(ObservableSource<? extends T> other) Flattens this and another ObservableSource into a single ObservableSource, without any transformation.
static <T> Observable<T>	never() Returns an Observable that never sends any items or notifications to an `Observer`.
final Observable<T>	observeOn(Scheduler scheduler, boolean delayError) Modifies an ObservableSource to perform its emissions and notifications on a specified `Scheduler`, asynchronously with an unbounded buffer with `bufferSize()` "island size" and optionally delays onError notifications.
final Observable<T>	observeOn(Scheduler scheduler) Modifies an ObservableSource to perform its emissions and notifications on a specified `Scheduler`, asynchronously with an unbounded buffer with `bufferSize()` "island size".
final Observable<T>	observeOn(Scheduler scheduler, boolean delayError, int bufferSize) Modifies an ObservableSource to perform its emissions and notifications on a specified `Scheduler`, asynchronously with an unbounded buffer of configurable "island size" and optionally delays onError notifications.
final <U> Observable<U>	ofType(Class<U> clazz) Filters the items emitted by an ObservableSource, only emitting those of the specified type.
final Observable<T>	onErrorResumeNext(Function<? super Throwable, ? extends ObservableSource<? extends T>> resumeFunction) Instructs an ObservableSource to pass control to another ObservableSource rather than invoking `onError` if it encounters an error.
final Observable<T>	onErrorResumeNext(ObservableSource<? extends T> next) Instructs an ObservableSource to pass control to another ObservableSource rather than invoking `onError` if it encounters an error.
final Observable<T>	onErrorReturn(Function<? super Throwable, ? extends T> valueSupplier) Instructs an ObservableSource to emit an item (returned by a specified function) rather than invoking `onError` if it encounters an error.
final Observable<T>	onErrorReturnItem(T item) Instructs an ObservableSource to emit an item (returned by a specified function) rather than invoking `onError` if it encounters an error.
final Observable<T>	onExceptionResumeNext(ObservableSource<? extends T> next) Instructs an ObservableSource to pass control to another ObservableSource rather than invoking `onError` if it encounters an `Exception`.
final Observable<T>	onTerminateDetach() Nulls out references to the upstream producer and downstream Observer if the sequence is terminated or downstream calls dispose().
final ConnectableObservable<T>	publish() Returns a `ConnectableObservable`, which is a variety of ObservableSource that waits until its `connect` method is called before it begins emitting items to those `Observer`s that have subscribed to it.
final <R> Observable<R>	publish(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) Returns an Observable that emits the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the underlying sequence.
static Observable<Integer>	range(int start, int count) Returns an Observable that emits a sequence of Integers within a specified range.
static Observable<Long>	rangeLong(long start, long count) Returns an Observable that emits a sequence of Longs within a specified range.
final Maybe<T>	reduce(BiFunction<T, T, T> reducer) Returns a Maybe that applies a specified accumulator function to the first item emitted by a source ObservableSource, then feeds the result of that function along with the second item emitted by the source ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, and emits the final result from the final call to your function as its sole item.
final <R> Single<R>	reduce(R seed, BiFunction<R, ? super T, R> reducer) Returns a Single that applies a specified accumulator function to the first item emitted by a source ObservableSource and a specified seed value, then feeds the result of that function along with the second item emitted by an ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, emitting the final result from the final call to your function as its sole item.
final <R> Single<R>	reduceWith(Callable<R> seedSupplier, BiFunction<R, ? super T, R> reducer) Returns a Single that applies a specified accumulator function to the first item emitted by a source ObservableSource and a seed value derived from calling a specified seedSupplier, then feeds the result of that function along with the second item emitted by an ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, emitting the final result from the final call to your function as its sole item.
final Observable<T>	repeat() Returns an Observable that repeats the sequence of items emitted by the source ObservableSource indefinitely.
final Observable<T>	repeat(long times) Returns an Observable that repeats the sequence of items emitted by the source ObservableSource at most `count` times.
final Observable<T>	repeatUntil(BooleanSupplier stop) Returns an Observable that repeats the sequence of items emitted by the source ObservableSource until the provided stop function returns true.
final Observable<T>	repeatWhen(Function<? super Observable<Object>, ? extends ObservableSource<?>> handler) Returns an Observable that emits the same values as the source ObservableSource with the exception of an `onComplete`.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, int bufferSize, Scheduler scheduler) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying a maximum of `bufferSize` items.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, int bufferSize) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying `bufferSize` notifications.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, int bufferSize, long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying no more than `bufferSize` items that were emitted within a specified time window.
final ConnectableObservable<T>	replay(int bufferSize, long time, TimeUnit unit) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource and replays at most `bufferSize` items that were emitted during a specified time window.
final ConnectableObservable<T>	replay(int bufferSize, long time, TimeUnit unit, Scheduler scheduler) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource and that replays a maximum of `bufferSize` items that are emitted within a specified time window.
final ConnectableObservable<T>	replay(int bufferSize) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource that replays at most `bufferSize` items emitted by that ObservableSource.
final ConnectableObservable<T>	replay() Returns a `ConnectableObservable` that shares a single subscription to the underlying ObservableSource that will replay all of its items and notifications to any future `Observer`.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, int bufferSize, long time, TimeUnit unit) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying no more than `bufferSize` items that were emitted within a specified time window.
final ConnectableObservable<T>	replay(long time, TimeUnit unit) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource and replays all items emitted by that ObservableSource within a specified time window.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) Returns an Observable that emits items that are the results of invoking a specified selector on the items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, Scheduler scheduler) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource.
final ConnectableObservable<T>	replay(Scheduler scheduler) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource that will replay all of its items and notifications to any future `Observer` on the given `Scheduler`.
final ConnectableObservable<T>	replay(int bufferSize, Scheduler scheduler) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource and replays at most `bufferSize` items emitted by that ObservableSource.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, long time, TimeUnit unit) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying all items that were emitted within a specified time window.
final <R> Observable<R>	replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits items that are the results of invoking a specified selector on items emitted by a `ConnectableObservable` that shares a single subscription to the source ObservableSource, replaying all items that were emitted within a specified time window.
final ConnectableObservable<T>	replay(long time, TimeUnit unit, Scheduler scheduler) Returns a `ConnectableObservable` that shares a single subscription to the source ObservableSource and replays all items emitted by that ObservableSource within a specified time window.
final Observable<T>	retry() Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls `onError` (infinite retry count).
final Observable<T>	retry(long times) Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls `onError` up to a specified number of retries.
final Observable<T>	retry(long times, Predicate<? super Throwable> predicate) Retries at most times or until the predicate returns false, whichever happens first.
final Observable<T>	retry(BiPredicate<? super Integer, ? super Throwable> predicate) Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls `onError` and the predicate returns true for that specific exception and retry count.
final Observable<T>	retry(Predicate<? super Throwable> predicate) Retries the current Observable if the predicate returns true.
final Observable<T>	retryUntil(BooleanSupplier stop) Retries until the given stop function returns true.
final Observable<T>	retryWhen(Function<? super Observable<Throwable>, ? extends ObservableSource<?>> handler) Returns an Observable that emits the same values as the source ObservableSource with the exception of an `onError`.
final void	safeSubscribe(Observer<? super T> s) Subscribes to the current Observable and wraps the given Observer into a SafeObserver (if not already a SafeObserver) that deals with exceptions thrown by a misbehaving Observer (that doesn't follow the Reactive-Streams specification).
final Observable<T>	sample(long period, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource within periodic time intervals, where the intervals are defined on a particular Scheduler.
final Observable<T>	sample(long period, TimeUnit unit) Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource within periodic time intervals.
final <U> Observable<T>	sample(ObservableSource<U> sampler) Returns an Observable that, when the specified `sampler` ObservableSource emits an item or completes, emits the most recently emitted item (if any) emitted by the source ObservableSource since the previous emission from the `sampler` ObservableSource.
final Observable<T>	sample(long period, TimeUnit unit, boolean emitLast) Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource within periodic time intervals and optionally emit the very last upstream item when the upstream completes.
final Observable<T>	sample(long period, TimeUnit unit, Scheduler scheduler, boolean emitLast) Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource within periodic time intervals, where the intervals are defined on a particular Scheduler and optionally emit the very last upstream item when the upstream completes.
final <U> Observable<T>	sample(ObservableSource<U> sampler, boolean emitLast) Returns an Observable that, when the specified `sampler` ObservableSource emits an item or completes, emits the most recently emitted item (if any) emitted by the source ObservableSource since the previous emission from the `sampler` ObservableSource and optionally emit the very last upstream item when the upstream or other ObservableSource complete.
final <R> Observable<R>	scan(R initialValue, BiFunction<R, ? super T, R> accumulator) Returns an Observable that applies a specified accumulator function to the first item emitted by a source ObservableSource and a seed value, then feeds the result of that function along with the second item emitted by the source ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, emitting the result of each of these iterations.
final Observable<T>	scan(BiFunction<T, T, T> accumulator) Returns an Observable that applies a specified accumulator function to the first item emitted by a source ObservableSource, then feeds the result of that function along with the second item emitted by the source ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, emitting the result of each of these iterations.
final <R> Observable<R>	scanWith(Callable<R> seedSupplier, BiFunction<R, ? super T, R> accumulator) Returns an Observable that applies a specified accumulator function to the first item emitted by a source ObservableSource and a seed value, then feeds the result of that function along with the second item emitted by the source ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource, emitting the result of each of these iterations.
static <T> Single<Boolean>	sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, int bufferSize) Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the same by comparing the items emitted by each ObservableSource pairwise.
static <T> Single<Boolean>	sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, BiPredicate<? super T, ? super T> isEqual, int bufferSize) Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the same by comparing the items emitted by each ObservableSource pairwise based on the results of a specified equality function.
static <T> Single<Boolean>	sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, BiPredicate<? super T, ? super T> isEqual) Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the same by comparing the items emitted by each ObservableSource pairwise based on the results of a specified equality function.
static <T> Single<Boolean>	sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the same by comparing the items emitted by each ObservableSource pairwise.
final Observable<T>	serialize() Forces an ObservableSource's emissions and notifications to be serialized and for it to obey the ObservableSource contract in other ways.
final Observable<T>	share() Returns a new `ObservableSource` that multicasts (shares) the original `ObservableSource`.
final Single<T>	single(T defaultItem) Returns a Single that emits the single item emitted by this Observable, if this Observable emits only a single item, or a default item if the source ObservableSource emits no items.
final Maybe<T>	singleElement() Returns a Maybe that emits the single item emitted by this Observable if this Observable emits only a single item, otherwise if this Observable emits more than one item or no items, an `IllegalArgumentException` or `NoSuchElementException` is signalled respectively.
final Single<T>	singleOrError() Returns a Single that emits the single item emitted by this Observable if this Observable emits only a single item, otherwise if this Observable completes without emitting any items or emits more than one item a `NoSuchElementException` or `IllegalArgumentException` will be signalled respectively.
final Observable<T>	skip(long count) Returns an Observable that skips the first `count` items emitted by the source ObservableSource and emits the remainder.
final Observable<T>	skip(long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that skips values emitted by the source ObservableSource before a specified time window on a specified `Scheduler` elapses.
final Observable<T>	skip(long time, TimeUnit unit) Returns an Observable that skips values emitted by the source ObservableSource before a specified time window elapses.
final Observable<T>	skipLast(int count) Returns an Observable that drops a specified number of items from the end of the sequence emitted by the source ObservableSource.
final Observable<T>	skipLast(long time, TimeUnit unit) Returns an Observable that drops items emitted by the source ObservableSource during a specified time window before the source completes.
final Observable<T>	skipLast(long time, TimeUnit unit, boolean delayError) Returns an Observable that drops items emitted by the source ObservableSource during a specified time window before the source completes.
final Observable<T>	skipLast(long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that drops items emitted by the source ObservableSource during a specified time window (defined on a specified scheduler) before the source completes.
final Observable<T>	skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) Returns an Observable that drops items emitted by the source ObservableSource during a specified time window (defined on a specified scheduler) before the source completes.
final Observable<T>	skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError) Returns an Observable that drops items emitted by the source ObservableSource during a specified time window (defined on a specified scheduler) before the source completes.
final <U> Observable<T>	skipUntil(ObservableSource<U> other) Returns an Observable that skips items emitted by the source ObservableSource until a second ObservableSource emits an item.
final Observable<T>	skipWhile(Predicate<? super T> predicate) Returns an Observable that skips all items emitted by the source ObservableSource as long as a specified condition holds true, but emits all further source items as soon as the condition becomes false.
final Observable<T>	sorted() Returns an Observable that emits the events emitted by source ObservableSource, in a sorted order.
final Observable<T>	sorted(Comparator<? super T> sortFunction) Returns an Observable that emits the events emitted by source ObservableSource, in a sorted order based on a specified comparison function.
final Observable<T>	startWith(ObservableSource<? extends T> other) Returns an Observable that emits the items in a specified `ObservableSource` before it begins to emit items emitted by the source ObservableSource.
final Observable<T>	startWith(Iterable<? extends T> items) Returns an Observable that emits the items in a specified `Iterable` before it begins to emit items emitted by the source ObservableSource.
final Observable<T>	startWith(T item) Returns an Observable that emits a specified item before it begins to emit items emitted by the source ObservableSource.
final Observable<T>	startWithArray(T... items) Returns an Observable that emits the specified items before it begins to emit items emitted by the source ObservableSource.
final Disposable	subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete, Consumer<? super Disposable> onSubscribe) Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error or completion notification it issues.
final void	subscribe(Observer<? super T> observer) Subscribes the given Observer to this ObservableSource instance.
final Disposable	subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete) Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error or completion notification it issues.
final Disposable	subscribe() Subscribes to an ObservableSource and ignores `onNext` and `onComplete` emissions.
final Disposable	subscribe(Consumer<? super T> onNext) Subscribes to an ObservableSource and provides a callback to handle the items it emits.
final Disposable	subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError) Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error notification it issues.
abstract void	subscribeActual(Observer<? super T> observer) Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.
final Observable<T>	subscribeOn(Scheduler scheduler) Asynchronously subscribes Observers to this ObservableSource on the specified `Scheduler`.
final <E extends Observer<? super T>> E	subscribeWith(E observer) Subscribes a given Observer (subclass) to this Observable and returns the given Observer as is.
final Observable<T>	switchIfEmpty(ObservableSource<? extends T> other) Returns an Observable that emits the items emitted by the source ObservableSource or the items of an alternate ObservableSource if the source ObservableSource is empty.
final <R> Observable<R>	switchMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted of these ObservableSources.
final <R> Observable<R>	switchMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted of these ObservableSources.
final <R> Observable<R>	switchMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted of these ObservableSources and delays any error until all ObservableSources terminate.
final <R> Observable<R>	switchMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted of these ObservableSources and delays any error until all ObservableSources terminate.
final <R> Observable<R>	switchMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns a SingleSource, and then emitting the item emitted by the most recently emitted of these SingleSources.
final <R> Observable<R>	switchMapSingleDelayError(Function<? super T, ? extends SingleSource<? extends R>> mapper) Returns a new ObservableSource by applying a function that you supply to each item emitted by the source ObservableSource that returns a SingleSource, and then emitting the item emitted by the most recently emitted of these SingleSources and delays any error until all SingleSources terminate.
static <T> Observable<T>	switchOnNext(ObservableSource<? extends ObservableSource<? extends T>> sources, int bufferSize) Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the most recently emitted of those ObservableSources.
static <T> Observable<T>	switchOnNext(ObservableSource<? extends ObservableSource<? extends T>> sources) Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the most recently emitted of those ObservableSources.
static <T> Observable<T>	switchOnNextDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the most recently emitted of those ObservableSources and delays any exception until all ObservableSources terminate.
static <T> Observable<T>	switchOnNextDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the most recently emitted of those ObservableSources and delays any exception until all ObservableSources terminate.
final Observable<T>	take(long time, TimeUnit unit) Returns an Observable that emits those items emitted by source ObservableSource before a specified time runs out.
final Observable<T>	take(long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits those items emitted by source ObservableSource before a specified time (on a specified Scheduler) runs out.
final Observable<T>	take(long count) Returns an Observable that emits only the first `count` items emitted by the source ObservableSource.
final Observable<T>	takeLast(long time, TimeUnit unit, boolean delayError) Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed.
final Observable<T>	takeLast(long count, long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) Returns an Observable that emits at most a specified number of items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed, where the timing information is provided by a given Scheduler.
final Observable<T>	takeLast(long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed, where the timing information is provided by a specified Scheduler.
final Observable<T>	takeLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError) Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed, where the timing information is provided by a specified Scheduler.
final Observable<T>	takeLast(int count) Returns an Observable that emits at most the last `count` items emitted by the source ObservableSource.
final Observable<T>	takeLast(long time, TimeUnit unit) Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed.
final Observable<T>	takeLast(long count, long time, TimeUnit unit) Returns an Observable that emits at most a specified number of items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed.
final Observable<T>	takeLast(long count, long time, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits at most a specified number of items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed, where the timing information is provided by a given Scheduler.
final Observable<T>	takeLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified window of time before the ObservableSource completed, where the timing information is provided by a specified Scheduler.
final Observable<T>	takeUntil(Predicate<? super T> stopPredicate) Returns an Observable that emits items emitted by the source Observable, checks the specified predicate for each item, and then completes when the condition is satisfied.
final <U> Observable<T>	takeUntil(ObservableSource<U> other) Returns an Observable that emits the items emitted by the source Observable until a second ObservableSource emits an item.
final Observable<T>	takeWhile(Predicate<? super T> predicate) Returns an Observable that emits items emitted by the source ObservableSource so long as each item satisfied a specified condition, and then completes as soon as this condition is not satisfied.
final TestObserver<T>	test(boolean dispose) Creates a TestObserver, optionally disposes it and then subscribes it to this Observable.
final TestObserver<T>	test() Creates a TestObserver and subscribes it to this Observable.
final Observable<T>	throttleFirst(long windowDuration, TimeUnit unit) Returns an Observable that emits only the first item emitted by the source ObservableSource during sequential time windows of a specified duration.
final Observable<T>	throttleFirst(long skipDuration, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits only the first item emitted by the source ObservableSource during sequential time windows of a specified duration, where the windows are managed by a specified Scheduler.
final Observable<T>	throttleLast(long intervalDuration, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits only the last item emitted by the source ObservableSource during sequential time windows of a specified duration, where the duration is governed by a specified Scheduler.
final Observable<T>	throttleLast(long intervalDuration, TimeUnit unit) Returns an Observable that emits only the last item emitted by the source ObservableSource during sequential time windows of a specified duration.
final Observable<T>	throttleWithTimeout(long timeout, TimeUnit unit, Scheduler scheduler) Returns an Observable that only emits those items emitted by the source ObservableSource that are not followed by another emitted item within a specified time window, where the time window is governed by a specified Scheduler.
final Observable<T>	throttleWithTimeout(long timeout, TimeUnit unit) Returns an Observable that only emits those items emitted by the source ObservableSource that are not followed by another emitted item within a specified time window.
final Observable<Timed<T>>	timeInterval(Scheduler scheduler) Returns an Observable that emits records of the time interval between consecutive items emitted by the source ObservableSource, where this interval is computed on a specified Scheduler.
final Observable<Timed<T>>	timeInterval(TimeUnit unit, Scheduler scheduler) Returns an Observable that emits records of the time interval between consecutive items emitted by the source ObservableSource, where this interval is computed on a specified Scheduler.
final Observable<Timed<T>>	timeInterval() Returns an Observable that emits records of the time interval between consecutive items emitted by the source ObservableSource.
final Observable<Timed<T>>	timeInterval(TimeUnit unit) Returns an Observable that emits records of the time interval between consecutive items emitted by the source ObservableSource.
final <V> Observable<T>	timeout(Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator, ObservableSource<? extends T> other) Returns an Observable that mirrors the source ObservableSource, but that switches to a fallback ObservableSource if an item emitted by the source ObservableSource doesn't arrive within a window of time after the emission of the previous item, where that period of time is measured by an ObservableSource that is a function of the previous item.
final Observable<T>	timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler, ObservableSource<? extends T> other) Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted item using a specified Scheduler.
final <U, V> Observable<T>	timeout(ObservableSource<U> firstTimeoutIndicator, Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator, ObservableSource<? extends T> other) Returns an Observable that mirrors the source ObservableSource, but switches to a fallback ObservableSource if either the first item emitted by the source ObservableSource or any subsequent item doesn't arrive within time windows defined by other ObservableSources.
final Observable<T>	timeout(long timeout, TimeUnit timeUnit) Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted item.
final Observable<T>	timeout(long timeout, TimeUnit timeUnit, ObservableSource<? extends T> other) Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted item.
final <U, V> Observable<T>	timeout(ObservableSource<U> firstTimeoutIndicator, Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator) Returns an Observable that mirrors the source ObservableSource, but notifies observers of a `TimeoutException` if either the first item emitted by the source ObservableSource or any subsequent item doesn't arrive within time windows defined by other ObservableSources.
final Observable<T>	timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler) Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted item, where this policy is governed on a specified Scheduler.
final <V> Observable<T>	timeout(Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator) Returns an Observable that mirrors the source ObservableSource, but notifies observers of a `TimeoutException` if an item emitted by the source ObservableSource doesn't arrive within a window of time after the emission of the previous item, where that period of time is measured by an ObservableSource that is a function of the previous item.
static Observable<Long>	timer(long delay, TimeUnit unit) Returns an Observable that emits `0L` after a specified delay, and then completes.
static Observable<Long>	timer(long delay, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits `0L` after a specified delay, on a specified Scheduler, and then completes.
final Observable<Timed<T>>	timestamp(TimeUnit unit, Scheduler scheduler) Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a `Timed` object whose timestamps are provided by a specified Scheduler.
final Observable<Timed<T>>	timestamp() Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a `Timed` object.
final Observable<Timed<T>>	timestamp(Scheduler scheduler) Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a `Timed` object whose timestamps are provided by a specified Scheduler.
final Observable<Timed<T>>	timestamp(TimeUnit unit) Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a `Timed` object.
final <R> R	to(Function<? super Observable<T>, R> converter) Calls the specified converter function during assembly time and returns its resulting value.
final Flowable<T>	toFlowable(BackpressureStrategy strategy) Converts the current Observable into a Flowable by applying the specified backpressure strategy.
final Future<T>	toFuture() Returns a `Future` representing the single value emitted by this `Observable`.
final <U extends Collection<? super T>> Single<U>	toList(Callable<U> collectionSupplier) Returns a Single that emits a single item, a list composed of all the items emitted by the finite source ObservableSource.
final Single<List<T>>	toList() Returns a Single that emits a single item, a list composed of all the items emitted by the finite source ObservableSource.
final Single<List<T>>	toList(int capacityHint) Returns a Single that emits a single item, a list composed of all the items emitted by the finite source ObservableSource.
final <K> Single<Map<K, T>>	toMap(Function<? super T, ? extends K> keySelector) Returns a Single that emits a single HashMap containing all items emitted by the source ObservableSource, mapped by the keys returned by a specified `keySelector` function.
final <K, V> Single<Map<K, V>>	toMap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector, Callable<? extends Map<K, V>> mapSupplier) Returns a Single that emits a single Map, returned by a specified `mapFactory` function, that contains keys and values extracted from the items emitted by the source ObservableSource.
final <K, V> Single<Map<K, V>>	toMap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector) Returns a Single that emits a single HashMap containing values corresponding to items emitted by the source ObservableSource, mapped by the keys returned by a specified `keySelector` function.
final <K> Single<Map<K, Collection<T>>>	toMultimap(Function<? super T, ? extends K> keySelector) Returns a Single that emits a single HashMap that contains an ArrayList of items emitted by the source ObservableSource keyed by a specified `keySelector` function.
final <K, V> Single<Map<K, Collection<V>>>	toMultimap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector, Callable<Map<K, Collection<V>>> mapSupplier) Returns a Single that emits a single Map, returned by a specified `mapFactory` function, that contains an ArrayList of values, extracted by a specified `valueSelector` function from items emitted by the source ObservableSource and keyed by the `keySelector` function.
final <K, V> Single<Map<K, Collection<V>>>	toMultimap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector) Returns a Single that emits a single HashMap that contains an ArrayList of values extracted by a specified `valueSelector` function from items emitted by the source ObservableSource, keyed by a specified `keySelector` function.
final <K, V> Single<Map<K, Collection<V>>>	toMultimap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector, Callable<? extends Map<K, Collection<V>>> mapSupplier, Function<? super K, ? extends Collection<? super V>> collectionFactory) Returns a Single that emits a single Map, returned by a specified `mapFactory` function, that contains a custom collection of values, extracted by a specified `valueSelector` function from items emitted by the source ObservableSource, and keyed by the `keySelector` function.
final Single<List<T>>	toSortedList(Comparator<? super T> comparator, int capacityHint) Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a sorted order based on a specified comparison function.
final Single<List<T>>	toSortedList(Comparator<? super T> comparator) Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a sorted order based on a specified comparison function.
final Single<List<T>>	toSortedList() Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a sorted order.
final Single<List<T>>	toSortedList(int capacityHint) Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a sorted order.
static <T> Observable<T>	unsafeCreate(ObservableSource<T> onSubscribe) Create an Observable by wrapping an ObservableSource which has to be implemented according to the Reactive-Streams-based Observable specification by handling cancellation correctly; no safeguards are provided by the Observable itself.
final Observable<T>	unsubscribeOn(Scheduler scheduler) Modifies the source ObservableSource so that subscribers will dispose it on a specified `Scheduler`.
static <T, D> Observable<T>	using(Callable<? extends D> resourceSupplier, Function<? super D, ? extends ObservableSource<? extends T>> sourceSupplier, Consumer<? super D> disposer, boolean eager) Constructs an ObservableSource that creates a dependent resource object which is disposed of just before termination if you have set `disposeEagerly` to `true` and a dispose() call does not occur before termination.
static <T, D> Observable<T>	using(Callable<? extends D> resourceSupplier, Function<? super D, ? extends ObservableSource<? extends T>> sourceSupplier, Consumer<? super D> disposer) Constructs an ObservableSource that creates a dependent resource object which is disposed of when the downstream calls dispose().
final <B> Observable<Observable<T>>	window(Callable<? extends ObservableSource<B>> boundary) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, Scheduler scheduler, long count, boolean restart) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <B> Observable<Observable<T>>	window(ObservableSource<B> boundary) Returns an Observable that emits non-overlapping windows of items it collects from the source ObservableSource where the boundary of each window is determined by the items emitted from a specified boundary-governing ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, Scheduler scheduler, long count, boolean restart, int bufferSize) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, Scheduler scheduler) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <B> Observable<Observable<T>>	window(ObservableSource<B> boundary, int bufferSize) Returns an Observable that emits non-overlapping windows of items it collects from the source ObservableSource where the boundary of each window is determined by the items emitted from a specified boundary-governing ObservableSource.
final Observable<Observable<T>>	window(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, int bufferSize) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <B> Observable<Observable<T>>	window(Callable<? extends ObservableSource<B>> boundary, int bufferSize) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long count) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long count, long skip) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <U, V> Observable<Observable<T>>	window(ObservableSource<U> openingIndicator, Function<? super U, ? extends ObservableSource<V>> closingIndicator) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, long timeskip, TimeUnit unit) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <U, V> Observable<Observable<T>>	window(ObservableSource<U> openingIndicator, Function<? super U, ? extends ObservableSource<V>> closingIndicator, int bufferSize) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, long count) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, long count, boolean restart) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit, Scheduler scheduler, long count) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long timespan, TimeUnit unit) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final Observable<Observable<T>>	window(long count, long skip, int bufferSize) Returns an Observable that emits windows of items it collects from the source ObservableSource.
final <R> Observable<R>	withLatestFrom(Iterable<? extends ObservableSource<?>> others, Function<? super Object[], R> combiner) Combines the value emission from this ObservableSource with the latest emissions from the other ObservableSources via a function to produce the output item.
final <T1, T2, R> Observable<R>	withLatestFrom(ObservableSource<T1> o1, ObservableSource<T2> o2, Function3<? super T, ? super T1, ? super T2, R> combiner) Combines the value emission from this ObservableSource with the latest emissions from the other ObservableSources via a function to produce the output item.
final <T1, T2, T3, T4, R> Observable<R>	withLatestFrom(ObservableSource<T1> o1, ObservableSource<T2> o2, ObservableSource<T3> o3, ObservableSource<T4> o4, Function5<? super T, ? super T1, ? super T2, ? super T3, ? super T4, R> combiner) Combines the value emission from this ObservableSource with the latest emissions from the other ObservableSources via a function to produce the output item.
final <U, R> Observable<R>	withLatestFrom(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> combiner) Merges the specified ObservableSource into this ObservableSource sequence by using the `resultSelector` function only when the source ObservableSource (this instance) emits an item.
final <T1, T2, T3, R> Observable<R>	withLatestFrom(ObservableSource<T1> o1, ObservableSource<T2> o2, ObservableSource<T3> o3, Function4<? super T, ? super T1, ? super T2, ? super T3, R> combiner) Combines the value emission from this ObservableSource with the latest emissions from the other ObservableSources via a function to produce the output item.
final <R> Observable<R>	withLatestFrom(ObservableSource[]<?> others, Function<? super Object[], R> combiner) Combines the value emission from this ObservableSource with the latest emissions from the other ObservableSources via a function to produce the output item.
static <T> Observable<T>	wrap(ObservableSource<T> source) Wraps an ObservableSource into an Observable if not already an Observable.
static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of seven items emitted, in sequence, by seven other ObservableSources.
static <T, R> Observable<R>	zip(ObservableSource<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of n items emitted, in sequence, by the n ObservableSources emitted by a specified ObservableSource.
static <T1, T2, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError, int bufferSize) Returns an Observable that emits the results of a specified combiner function applied to combinations of two items emitted, in sequence, by two other ObservableSources.
static <T1, T2, T3, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of three items emitted, in sequence, by three other ObservableSources.
static <T1, T2, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError) Returns an Observable that emits the results of a specified combiner function applied to combinations of two items emitted, in sequence, by two other ObservableSources.
static <T, R> Observable<R>	zip(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of items emitted, in sequence, by an Iterable of other ObservableSources.
static <T1, T2, T3, T4, T5, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of five items emitted, in sequence, by five other ObservableSources.
static <T1, T2, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, BiFunction<? super T1, ? super T2, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of two items emitted, in sequence, by two other ObservableSources.
static <T1, T2, T3, T4, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of four items emitted, in sequence, by four other ObservableSources.
static <T1, T2, T3, T4, T5, T6, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of six items emitted, in sequence, by six other ObservableSources.
static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of eight items emitted, in sequence, by eight other ObservableSources.
static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R>	zip(ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6, ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, ObservableSource<? extends T9> source9, Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper) Returns an Observable that emits the results of a specified combiner function applied to combinations of nine items emitted, in sequence, by nine other ObservableSources.
static <T, R> Observable<R>	zipArray(Function<? super Object[], ? extends R> zipper, boolean delayError, int bufferSize, ObservableSource...<? extends T> sources) Returns an Observable that emits the results of a specified combiner function applied to combinations of items emitted, in sequence, by an array of other ObservableSources.
static <T, R> Observable<R>	zipIterable(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper, boolean delayError, int bufferSize) Returns an Observable that emits the results of a specified combiner function applied to combinations of items emitted, in sequence, by an Iterable of other ObservableSources.
final <U, R> Observable<R>	zipWith(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> zipper) Returns an Observable that emits items that are the result of applying a specified function to pairs of values, one each from the source ObservableSource and another specified ObservableSource.
final <U, R> Observable<R>	zipWith(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> zipper, boolean delayError) Returns an Observable that emits items that are the result of applying a specified function to pairs of values, one each from the source ObservableSource and another specified ObservableSource.
final <U, R> Observable<R>	zipWith(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> zipper, boolean delayError, int bufferSize) Returns an Observable that emits items that are the result of applying a specified function to pairs of values, one each from the source ObservableSource and another specified ObservableSource.
final <U, R> Observable<R>	zipWith(Iterable<U> other, BiFunction<? super T, ? super U, ? extends R> zipper) Returns an Observable that emits items that are the result of applying a specified function to pairs of values, one each from the source ObservableSource and a specified Iterable sequence.

From class java.lang.Object

From interface io.reactivex.ObservableSource

From interface io.reactivex.Observer

Public Methods

public static BehaviorSubject<T> create ()

Creates a BehaviorSubject without a default item.

Returns

the constructed BehaviorSubject

public static BehaviorSubject<T> createDefault (T defaultValue)

Creates a BehaviorSubject that emits the last item it observed and all subsequent items to each Observer that subscribes to it.

Parameters

defaultValue	the item that will be emitted first to any `Observer` as long as the `BehaviorSubject` has not yet observed any items from its source `Observable`

Returns

the constructed BehaviorSubject

public Throwable getThrowable ()

Returns the error that caused the Subject to terminate or null if the Subject hasn't terminated yet.

The method is thread-safe.

Returns

the error that caused the Subject to terminate or null if the Subject hasn't terminated yet

public T getValue ()

Returns a single value the Subject currently has or null if no such value exists.

The method is thread-safe.

Returns

a single value the Subject currently has or null if no such value exists

public T[] getValues (T[] array)

Returns a typed array containing a snapshot of all values of the Subject.

The method follows the conventions of Collection.toArray by setting the array element after the last value to null (if the capacity permits).

The method is thread-safe.

Parameters

array	the target array to copy values into if it fits

Returns

the given array if the values fit into it or a new array containing all values

public Object[] getValues ()

Returns an Object array containing snapshot all values of the Subject.

The method is thread-safe.

Returns

the array containing the snapshot of all values of the Subject

public boolean hasComplete ()

Returns true if the subject has reached a terminal state through a complete event.

The method is thread-safe.

Returns

true if the subject has reached a terminal state through a complete event

public boolean hasObservers ()

Returns true if the subject has any Observers.

The method is thread-safe.

Returns

true if the subject has any Observers

public boolean hasThrowable ()

Returns true if the subject has reached a terminal state through an error event.

The method is thread-safe.

Returns

true if the subject has reached a terminal state through an error event

public boolean hasValue ()

Returns true if the subject has any value.

The method is thread-safe.

Returns

true if the subject has any value

public void onComplete ()

public void onError (Throwable t)

public void onNext (T t)

public void onSubscribe (Disposable s)

Protected Methods

protected void subscribeActual (Observer<? super T> observer)

Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.

There is no need to call any of the plugin hooks on the current Observable instance or the Subscriber.

Parameters

observer	the incoming Observer, never null

Classes

BehaviorSubject

Class Overview

Summary

Public Methods

public static BehaviorSubject<T> create ()

Returns

public static BehaviorSubject<T> createDefault (T defaultValue)

Parameters

Returns

public Throwable getThrowable ()

Returns

public T getValue ()

Returns

public T[] getValues (T[] array)

Parameters

Returns

public Object[] getValues ()

Returns

public boolean hasComplete ()

Returns

public boolean hasObservers ()

Returns

public boolean hasThrowable ()

Returns

public boolean hasValue ()

Returns

public void onComplete ()

public void onError (Throwable t)

public void onNext (T t)

public void onSubscribe (Disposable s)

Protected Methods

protected void subscribeActual (Observer<? super T> observer)

Parameters