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Added in API level 1

Summary: Methods | Inherited Methods | [Expand All]

Array

public final class Array
extends Object

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.

Summary

Public methods
`static Object`	`get(Object array, int index)` Returns the value of the indexed component in the specified array object.
`static boolean`	`getBoolean(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `boolean`.
`static byte`	`getByte(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `byte`.
`static char`	`getChar(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `char`.
`static double`	`getDouble(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `double`.
`static float`	`getFloat(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `float`.
`static int`	`getInt(Object array, int index)` Returns the value of the indexed component in the specified array object, as an `int`.
`static int`	`getLength(Object array)` Returns the length of the specified array object, as an `int`.
`static long`	`getLong(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `long`.
`static short`	`getShort(Object array, int index)` Returns the value of the indexed component in the specified array object, as a `short`.
`static Object`	`newInstance(Class<?> componentType, int length)` Creates a new array with the specified component type and length.
`static Object`	`newInstance(Class<?> componentType, int... dimensions)` Creates a new array with the specified component type and dimensions.
`static void`	`set(Object array, int index, Object value)` Sets the value of the indexed component of the specified array object to the specified new value.
`static void`	`setBoolean(Object array, int index, boolean value)` Sets the value of the indexed component of the specified array object to the specified `boolean` value.
`static void`	`setByte(Object array, int index, byte value)` Sets the value of the indexed component of the specified array object to the specified `byte` value.
`static void`	`setChar(Object array, int index, char value)` Sets the value of the indexed component of the specified array object to the specified `char` value.
`static void`	`setDouble(Object array, int index, double value)` Sets the value of the indexed component of the specified array object to the specified `double` value.
`static void`	`setFloat(Object array, int index, float value)` Sets the value of the indexed component of the specified array object to the specified `float` value.
`static void`	`setInt(Object array, int index, int value)` Sets the value of the indexed component of the specified array object to the specified `int` value.
`static void`	`setLong(Object array, int index, long value)` Sets the value of the indexed component of the specified array object to the specified `long` value.
`static void`	`setShort(Object array, int index, short value)` Sets the value of the indexed component of the specified array object to the specified `short` value.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public methods

get

Added in API level 1

Object get (Object array, 
                int index)

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.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`Object`	the (possibly wrapped) value of the indexed component in the specified array

Throws
`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

getBoolean

Added in API level 1

boolean getBoolean (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a boolean.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`boolean`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getByte

Added in API level 1

byte getByte (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a byte.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`byte`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getChar

Added in API level 1

char getChar (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a char.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`char`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getDouble

Added in API level 1

double getDouble (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a double.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`double`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getFloat

Added in API level 1

float getFloat (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a float.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`float`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getInt

Added in API level 1

int getInt (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as an int.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`int`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getLength

Added in API level 1

int getLength (Object array)

Returns the length of the specified array object, as an int.

Parameters
`array`	`Object`: the array

Returns
`int`	the length of the array

Throws
`IllegalArgumentException`	if the object argument is not an array

getLong

Added in API level 1

long getLong (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a long.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`long`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

getShort

Added in API level 1

short getShort (Object array, 
                int index)

Returns the value of the indexed component in the specified array object, as a short.

Parameters
`array`	`Object`: the array
`index`	`int`: the index

Returns
`short`	the value of the indexed component in the specified array

Throws
`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

See also:

get(Object, int)

newInstance

Added in API level 1

Object newInstance (Class<?> componentType, 
                int length)

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);

Parameters
`componentType`	`Class`: the `Class` object representing the component type of the new array
`length`	`int`: the length of the new array

Returns
`Object`	the new array

Throws
`NullPointerException`	if the specified `componentType` parameter is null
`IllegalArgumentException`	if componentType is `TYPE`
`NegativeArraySizeException`	if the specified `length` is negative

newInstance

Added in API level 9

Object newInstance (Class<?> componentType, 
                int... dimensions)

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).

Parameters
`componentType`	`Class`: the `Class` object representing the component type of the new array
`dimensions`	`int`: an array of `int` representing the dimensions of the new array

Returns
`Object`	the new array

Throws
`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.

set

Added in API level 1

void set (Object array, 
                int index, 
                Object value)

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.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`Object`: the new value of the indexed component

Throws
`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

setBoolean

Added in API level 1

void setBoolean (Object array, 
                int index, 
                boolean value)

Sets the value of the indexed component of the specified array object to the specified boolean value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`boolean`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setByte

Added in API level 1

void setByte (Object array, 
                int index, 
                byte value)

Sets the value of the indexed component of the specified array object to the specified byte value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`byte`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setChar

Added in API level 1

void setChar (Object array, 
                int index, 
                char value)

Sets the value of the indexed component of the specified array object to the specified char value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`char`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setDouble

Added in API level 1

void setDouble (Object array, 
                int index, 
                double value)

Sets the value of the indexed component of the specified array object to the specified double value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`double`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setFloat

Added in API level 1

void setFloat (Object array, 
                int index, 
                float value)

Sets the value of the indexed component of the specified array object to the specified float value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`float`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setInt

Added in API level 1

void setInt (Object array, 
                int index, 
                int value)

Sets the value of the indexed component of the specified array object to the specified int value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`int`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setLong

Added in API level 1

void setLong (Object array, 
                int index, 
                long value)

Sets the value of the indexed component of the specified array object to the specified long value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`long`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

setShort

Added in API level 1

void setShort (Object array, 
                int index, 
                short value)

Sets the value of the indexed component of the specified array object to the specified short value.

Parameters
`array`	`Object`: the array
`index`	`int`: the index into the array
`value`	`short`: the new value of the indexed component

Throws
`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

See also:

set(Object, int, Object)

Interfaces

Classes

Exceptions

Errors

Most visited

Recently visited

Results for

Array

Summary

Public methods

Inherited methods

Public methods

get

getBoolean

getByte

getChar

getDouble

getFloat

getInt

getLength

getLong

getShort

newInstance

newInstance

set

setBoolean

setByte

setChar

setDouble

setFloat

setInt

setLong

setShort