java.lang.Object | |
↳ | java.lang.reflect.Array |
The Array
class provides static methods to dynamically create and
access Java arrays.
Array
permits widening conversions to occur during a get or set
operation, but throws an IllegalArgumentException
if a narrowing
conversion would occur.
Public Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Returns the value of the indexed component in the specified
array object.
| |||||||||||
Returns the value of the indexed component in the specified
array object, as a
boolean . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
byte . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
char . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
double . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
float . | |||||||||||
Returns the value of the indexed component in the specified
array object, as an
int . | |||||||||||
Returns the length of the specified array object, as an
int . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
long . | |||||||||||
Returns the value of the indexed component in the specified
array object, as a
short . | |||||||||||
Creates a new array with the specified component type and
length.
| |||||||||||
Creates a new array
with the specified component type and dimensions.
| |||||||||||
Sets the value of the indexed component of the specified array
object to the specified new value.
| |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
boolean value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
byte value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
char value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
double value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
float value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
int value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
long value. | |||||||||||
Sets the value of the indexed component of the specified array
object to the specified
short value. |
[Expand]
Inherited Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.lang.Object
|
Returns the value of the indexed component in the specified array object. The value is automatically wrapped in an object if it has a primitive type.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array
|
Returns the value of the indexed component in the specified
array object, as a boolean
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as a byte
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as a char
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as a double
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as a float
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as an int
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the length of the specified array object, as an int
.
array | the array |
---|
IllegalArgumentException | if the object argument is not an array |
---|
Returns the value of the indexed component in the specified
array object, as a long
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Returns the value of the indexed component in the specified
array object, as a short
.
array | the array |
---|---|
index | the index |
NullPointerException | If the specified object is null |
---|---|
IllegalArgumentException | If the specified object is not an array, or if the indexed element cannot be converted to the return type by an identity or widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to the
length of the specified array |
Creates a new array with the specified component type and length. Invoking this method is equivalent to creating an array as follows:
int[] x = {length}; Array.newInstance(componentType, x);
componentType | the Class object representing the
component type of the new array |
---|---|
length | the length of the new array |
NullPointerException | if the specified
componentType parameter is null |
---|---|
IllegalArgumentException | if componentType is TYPE |
NegativeArraySizeException | if the specified length
is negative
|
Creates a new array
with the specified component type and dimensions.
If componentType
represents a non-array class or interface, the new array
has dimensions.length
dimensions and
componentType
as its component type. If
componentType
represents an array class, the
number of dimensions of the new array is equal to the sum
of dimensions.length
and the number of
dimensions of componentType
. In this case, the
component type of the new array is the component type of
componentType
.
The number of dimensions of the new array must not exceed the number of array dimensions supported by the implementation (typically 255).
componentType | the Class object representing the component
type of the new array |
---|---|
dimensions | an array of int representing the dimensions of
the new array |
NullPointerException | if the specified
componentType argument is null |
---|---|
IllegalArgumentException | if the specified dimensions
argument is a zero-dimensional array, or if the number of
requested dimensions exceeds the limit on the number of array dimensions
supported by the implementation (typically 255), or if componentType
is TYPE . |
NegativeArraySizeException | if any of the components in
the specified dimensions argument is negative.
|
Sets the value of the indexed component of the specified array object to the specified new value. The new value is first automatically unwrapped if the array has a primitive component type.
array | the array |
---|---|
index | the index into the array |
value | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the array component type is primitive and an unwrapping conversion fails |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array
|
Sets the value of the indexed component of the specified array
object to the specified boolean
value.
array | the array |
---|---|
index | the index into the array |
z | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified byte
value.
array | the array |
---|---|
index | the index into the array |
b | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified char
value.
array | the array |
---|---|
index | the index into the array |
c | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified double
value.
array | the array |
---|---|
index | the index into the array |
d | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified float
value.
array | the array |
---|---|
index | the index into the array |
f | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified int
value.
array | the array |
---|---|
index | the index into the array |
i | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified long
value.
array | the array |
---|---|
index | the index into the array |
l | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |
Sets the value of the indexed component of the specified array
object to the specified short
value.
array | the array |
---|---|
index | the index into the array |
s | the new value of the indexed component |
NullPointerException | If the specified object argument is null |
---|---|
IllegalArgumentException | If the specified object argument is not an array, or if the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening conversion |
ArrayIndexOutOfBoundsException | If the specified index
argument is negative, or if it is greater than or equal to
the length of the specified array |