Package java.lang.reflect

Class Array

java.lang.Object

java.lang.reflect.Array

public final class Array
extends Object

Provides static methods to create and access arrays dynamically.

Method Summary

Modifier and Type	Method	Description
static Object	get(Object array, int index)	Returns the element of the array at the specified index.
static boolean	getBoolean(Object array, int index)	Returns the boolean at the given index in the given boolean array.
static byte	getByte(Object array, int index)	Returns the byte at the given index in the given byte array.
static char	getChar(Object array, int index)	Returns the char at the given index in the given char array.
static double	getDouble(Object array, int index)	Returns the double at the given index in the given array.
static float	getFloat(Object array, int index)	Returns the float at the given index in the given array.
static int	getInt(Object array, int index)	Returns the int at the given index in the given array.
static int	getLength(Object array)	Returns the length of the array.
static long	getLong(Object array, int index)	Returns the long at the given index in the given array.
static short	getShort(Object array, int index)	Returns the short at the given index in the given array.
static Object	newInstance(Class<?> componentType, int size)	Returns a new array of the specified component type and length.
static Object	newInstance(Class<?> componentType, int... dimensions)	Returns a new multidimensional array of the specified component type and dimensions.
static void	set(Object array, int index, Object value)	Sets the element of the array at the specified index to the value.
static void	setBoolean(Object array, int index, boolean value)	Sets array[index] = value.
static void	setByte(Object array, int index, byte value)	Sets array[index] = value.
static void	setChar(Object array, int index, char value)	Sets array[index] = value.
static void	setDouble(Object array, int index, double value)	Sets array[index] = value.
static void	setFloat(Object array, int index, float value)	Sets array[index] = value.
static void	setInt(Object array, int index, int value)	Sets array[index] = value.
static void	setLong(Object array, int index, long value)	Sets array[index] = value.
static void	setShort(Object array, int index, short value)	Sets array[index] = value.

Methods inherited from class java.lang.Object

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

Method Details

get

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

Returns the element of the array at the specified index. Equivalent to array[index]. If the array component is a primitive type, the result is automatically boxed.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getBoolean

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

Returns the boolean at the given index in the given boolean array.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getByte

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

Returns the byte at the given index in the given byte array.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getChar

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

Returns the char at the given index in the given char array.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getDouble

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

Returns the double at the given index in the given array. Applies to byte, char, float, double, int, long, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getFloat

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

Returns the float at the given index in the given array. Applies to byte, char, float, int, long, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getInt

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

Returns the int at the given index in the given array. Applies to byte, char, int, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getLength

public static int getLength(Object array)

Returns the length of the array. Equivalent to array.length.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array

getLong

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

Returns the long at the given index in the given array. Applies to byte, char, int, long, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

getShort

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

Returns the short at the given index in the given array. Applies to byte and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the element at the index position can not be converted to the return type

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

newInstance

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

Returns a new multidimensional array of the specified component type and dimensions. Equivalent to new componentType[d0][d1]...[dn] for a dimensions array of { d0, d1, ... , dn }.

Throws:

NullPointerException - if array == null

NegativeArraySizeException - if any of the dimensions are negative

IllegalArgumentException - if the array of dimensions is of size zero, or exceeds the limit of the number of dimension for an array (currently 255)

newInstance

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

Returns a new array of the specified component type and length. Equivalent to new componentType[size].

Throws:

NullPointerException - if the component type is null

NegativeArraySizeException - if size < 0

set

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

Sets the element of the array at the specified index to the value. Equivalent to array[index] = value. If the array component is a primitive type, the value is automatically unboxed.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setBoolean

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

Sets array[index] = value. Applies to boolean arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setByte

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

Sets array[index] = value. Applies to byte, double, float, int, long, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setChar

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

Sets array[index] = value. Applies to char, double, float, int, and long arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setDouble

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

Sets array[index] = value. Applies to double arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setFloat

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

Sets array[index] = value. Applies to double and float arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setInt

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

Sets array[index] = value. Applies to double, float, int, and long arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setLong

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

Sets array[index] = value. Applies to double, float, and long arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length

setShort

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

Sets array[index] = value. Applies to double, float, int, long, and short arrays.

Throws:

NullPointerException - if array == null

IllegalArgumentException - if the array is not an array or the value cannot be converted to the array type by a widening conversion

ArrayIndexOutOfBoundsException - if index < 0 || index >= array.length