Class java.lang.reflect.Array
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Class java.lang.reflect.Array
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.
- Author:
- Nakul Saraiya
-
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.
get
public static native java.lang.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
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
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
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
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
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
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
newInstance
public static java.lang.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 java.lang.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.
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
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
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
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
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
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