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java.lang.reflect
Class Array

java.lang.Object
  java.lang.reflect.Array

public final class Array
extends Object

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.

Method Summary

Modifier and Type	Method and Description
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... dimensions) Creates a new array with the specified component type and dimensions.
static Object	newInstance(Class<?> componentType, int length) Creates a new array with the specified component type and length.
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 z) 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 b) 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 c) 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 d) 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 f) 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 i) 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 l) 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 s) Sets the value of the indexed component of the specified array object to the specified short value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

newInstance

public static Object newInstance(Class<?> componentType,
                                 int length)
                          throws NegativeArraySizeException

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 - the Class object representing the component type of the new array

length - the length of the new array

Returns:

the new array

Throws:

NullPointerException - if the specified componentType parameter is null

IllegalArgumentException - if componentType is Void.TYPE

NegativeArraySizeException - if the specified length is negative

newInstance

public static Object newInstance(Class<?> componentType,
                                 int... dimensions)
                          throws IllegalArgumentException,
                                 NegativeArraySizeException

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 - the Class object representing the component type of the new array

dimensions - an array of int representing the dimensions of the new array

Returns:

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 Void.TYPE.

NegativeArraySizeException - if any of the components in the specified dimensions argument is negative.

getLength

public static int getLength(Object array)
                     throws IllegalArgumentException

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

Parameters:

array - the array

Returns:

the length of the array

Throws:

IllegalArgumentException - if the object argument is not an array

get

public static Object get(Object array,
                         int index)
                  throws IllegalArgumentException,
                         ArrayIndexOutOfBoundsException

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 - the array

index - the index

Returns:

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

public static boolean getBoolean(Object array,
                                 int index)
                          throws IllegalArgumentException,
                                 ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getByte

public static byte getByte(Object array,
                           int index)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getChar

public static char getChar(Object array,
                           int index)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getShort

public static short getShort(Object array,
                             int index)
                      throws IllegalArgumentException,
                             ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getInt

public static int getInt(Object array,
                         int index)
                  throws IllegalArgumentException,
                         ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getLong

public static long getLong(Object array,
                           int index)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getFloat

public static float getFloat(Object array,
                             int index)
                      throws IllegalArgumentException,
                             ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

getDouble

public static double getDouble(Object array,
                               int index)
                        throws IllegalArgumentException,
                               ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index

Returns:

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(java.lang.Object, int)

set

public static void set(Object array,
                       int index,
                       Object value)
                throws IllegalArgumentException,
                       ArrayIndexOutOfBoundsException

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 - the array

index - the index into the array

value - 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

public static void setBoolean(Object array,
                              int index,
                              boolean z)
                       throws IllegalArgumentException,
                              ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

z - 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(java.lang.Object, int, java.lang.Object)

setByte

public static void setByte(Object array,
                           int index,
                           byte b)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

b - 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(java.lang.Object, int, java.lang.Object)

setChar

public static void setChar(Object array,
                           int index,
                           char c)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

c - 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(java.lang.Object, int, java.lang.Object)

setShort

public static void setShort(Object array,
                            int index,
                            short s)
                     throws IllegalArgumentException,
                            ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

s - 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(java.lang.Object, int, java.lang.Object)

setInt

public static void setInt(Object array,
                          int index,
                          int i)
                   throws IllegalArgumentException,
                          ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

i - 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(java.lang.Object, int, java.lang.Object)

setLong

public static void setLong(Object array,
                           int index,
                           long l)
                    throws IllegalArgumentException,
                           ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

l - 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(java.lang.Object, int, java.lang.Object)

setFloat

public static void setFloat(Object array,
                            int index,
                            float f)
                     throws IllegalArgumentException,
                            ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

f - 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(java.lang.Object, int, java.lang.Object)

setDouble

public static void setDouble(Object array,
                             int index,
                             double d)
                      throws IllegalArgumentException,
                             ArrayIndexOutOfBoundsException

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

Parameters:

array - the array

index - the index into the array

d - 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(java.lang.Object, int, java.lang.Object)