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AtomicReferenceArray (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.util.concurrent.atomic
Class AtomicReferenceArray<E>

java.lang.Object
  java.util.concurrent.atomic.AtomicReferenceArray<E>

Type Parameters:

E - The base class of elements held in this array

All Implemented Interfaces:

Serializable

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public class AtomicReferenceArray<E>
extends Object
implements Serializable

An array of object references in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

Since:

1.5

See Also:

Serialized Form

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Constructor Summary
AtomicReferenceArray(E[] array)           Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.
AtomicReferenceArray(int length)           Creates a new AtomicReferenceArray of given length.

 

Method Summary
boolean	compareAndSet(int i, E expect, E update)           Atomically sets the element at position i to the given updated value if the current value == the expected value.
E	get(int i)           Gets the current value at position i.
E	getAndSet(int i, E newValue)           Atomically sets the element at position i to the given value and returns the old value.
void	lazySet(int i, E newValue)           Eventually sets the element at position i to the given value.
int	length()           Returns the length of the array.
void	set(int i, E newValue)           Sets the element at position i to the given value.
String	toString()           Returns the String representation of the current values of array.
boolean	weakCompareAndSet(int i, E expect, E update)           Atomically sets the element at position i to the given updated value if the current value == the expected value.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

AtomicReferenceArray

public AtomicReferenceArray(int length)

Creates a new AtomicReferenceArray of given length.

Parameters:

length - the length of the array

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AtomicReferenceArray

public AtomicReferenceArray(E[] array)

Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.

Parameters:

array - the array to copy elements from

Throws:

NullPointerException - if array is null

Method Detail

length

public final int length()

Returns the length of the array.

Returns:

the length of the array

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get

public final E get(int i)

Gets the current value at position i.

Parameters:

i - the index

Returns:

the current value

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set

public final void set(int i,
                      E newValue)

Sets the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

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lazySet

public final void lazySet(int i,
                          E newValue)

Eventually sets the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

Since:

1.6

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getAndSet

public final E getAndSet(int i,
                         E newValue)

Atomically sets the element at position i to the given value and returns the old value.

Parameters:

i - the index

newValue - the new value

Returns:

the previous value

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compareAndSet

public final boolean compareAndSet(int i,
                                   E expect,
                                   E update)

Atomically sets the element at position i to the given updated value if the current value == the expected value.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.

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weakCompareAndSet

public final boolean weakCompareAndSet(int i,
                                       E expect,
                                       E update)

Atomically sets the element at position i to the given updated value if the current value == the expected value.

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful.

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toString

public String toString()

Returns the String representation of the current values of array.

Overrides:

toString in class Object

Returns:

the String representation of the current values of array.

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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