java.lang.Object | ||||
↳ | java.util.AbstractCollection | |||
↳ | java.util.AbstractList | |||
↳ | java.util.ArrayList | |||
↳ | org.apache.commons.collections.ArrayStack |
An implementation of the java.util.Stack API that is based on an
ArrayList
instead of a Vector
, so it is not
synchronized to protect against multi-threaded access. The implementation
is therefore operates faster in environments where you do not need to
worry about multiple thread contention.
The removal order of an ArrayStack
is based on insertion
order: The most recently added element is removed first. The iteration
order is not the same as the removal order. The iterator returns
elements from the bottom up, whereas the remove()
method removes
them from the top down.
Unlike Stack
, ArrayStack
accepts null entries.
Note: this class should be bytecode-identical to the version in commons collections. This is required to allow backwards compability with both previous versions of BeanUtils and also allow coexistance with both collections 2.1 and 3.0.
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Inherited Fields | |||||||||||
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From class
java.util.AbstractList
|
Public Constructors | |||||||||||
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Constructs a new empty
ArrayStack . | |||||||||||
Constructs a new empty
ArrayStack with an initial size. |
Public Methods | |||||||||||
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Return
true if this stack is currently empty. | |||||||||||
Returns the element on the top of the stack.
| |||||||||||
Returns the n'th item down (zero-relative) from the top of this
stack without removing it.
| |||||||||||
Returns the top item off of this stack without removing it.
| |||||||||||
Pops the top item off of this stack and return it.
| |||||||||||
Pushes a new item onto the top of this stack.
| |||||||||||
Removes the element on the top of the stack.
| |||||||||||
Returns the one-based position of the distance from the top that the
specified object exists on this stack, where the top-most element is
considered to be at distance
1 . |
[Expand]
Inherited Methods | |||||||||||
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From class
java.util.ArrayList
| |||||||||||
From class
java.util.AbstractList
| |||||||||||
From class
java.util.AbstractCollection
| |||||||||||
From class
java.lang.Object
| |||||||||||
From interface
java.lang.Iterable
| |||||||||||
From interface
java.util.Collection
| |||||||||||
From interface
java.util.List
| |||||||||||
From interface
org.apache.commons.collections.Buffer
|
Constructs a new empty ArrayStack
. The initial size
is controlled by ArrayList
and is currently 10.
Constructs a new empty ArrayStack
with an initial size.
initialSize | the initial size to use |
---|
IllegalArgumentException | if the specified initial size is negative |
---|
Return true
if this stack is currently empty.
This method exists for compatibility with java.util.Stack
.
New users of this class should use isEmpty
instead.
Returns the element on the top of the stack.
BufferUnderflowException | if the stack is empty |
---|
Returns the n'th item down (zero-relative) from the top of this stack without removing it.
n | the number of items down to go |
---|
EmptyStackException | if there are not enough items on the stack to satisfy this request |
---|
Returns the top item off of this stack without removing it.
EmptyStackException | if the stack is empty |
---|
Pops the top item off of this stack and return it.
EmptyStackException | if the stack is empty |
---|
Pushes a new item onto the top of this stack. The pushed item is also
returned. This is equivalent to calling add
.
item | the item to be added |
---|
Removes the element on the top of the stack.
BufferUnderflowException | if the stack is empty |
---|
Returns the one-based position of the distance from the top that the
specified object exists on this stack, where the top-most element is
considered to be at distance 1
. If the object is not
present on the stack, return -1
instead. The
equals()
method is used to compare to the items
in this stack.
object | the object to be searched for |
---|