Class java.lang.reflect.Array - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.lang.reflect.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.

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

newInstance

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

Creates a new array with the specified component type and length. The effect is that of the equivalent array creation expression:

    new componentType[length]

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
Throws: 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.

The effect is that of the equivalent array creation expression:

    new componentType[dimensions[0]][dimensions[1]]...

Parameters:: componentType - the Class object representing the component type of the new array; dimensions - an array of ints representing the dimensions of the new array
Returns:: the new array
Throws: NullPointerException: if the specified componentType argument is null
Throws: 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).
Throws: NegativeArraySizeException: if any of the components in the specified dimension argument is negative.

getLength

 public static native 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 native 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
Throws: IllegalArgumentException: If the specified object is not an array
Throws: 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 native 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
Throws: 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
Throws: 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

getByte

 public static native 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
Throws: 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
Throws: 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

getChar

 public static native 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
Throws: 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
Throws: 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

getShort

 public static native 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
Throws: 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
Throws: 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

getInt

 public static native 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
Throws: 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
Throws: 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

getLong

 public static native 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
Throws: 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
Throws: 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

getFloat

 public static native 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
Throws: 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
Throws: 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

getDouble

 public static native 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
Throws: 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
Throws: 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

set

 public static native 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, or if the array component type is primitive and the specified value is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the array component type is primitive and the specified value cannot be converted to the primitive type by a combination of unwrapping and identity or widening conversions
Throws: 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 native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setByte

 public static native 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 boolean value.

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
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setChar

 public static native 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 byte value.

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
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setShort

 public static native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setInt

 public static native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setLong

 public static native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setFloat

 public static native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

setDouble

 public static native 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; value - the new value of the indexed component
Throws: NullPointerException: If the specified object argument is null
Throws: IllegalArgumentException: If the specified object argument is not an array, or if the the specified value cannot be converted to the underlying array's component type by an identity or a primitive widening widening conversion
Throws: 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

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