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AtomicIntegerArray (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 AtomicIntegerArray

java.lang.Object
  java.util.concurrent.atomic.AtomicIntegerArray

All Implemented Interfaces:

Serializable

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public class AtomicIntegerArray
extends Object
implements Serializable

An int array 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
AtomicIntegerArray(int length)           Creates a new AtomicIntegerArray of given length.
AtomicIntegerArray(int[] array)           Creates a new AtomicIntegerArray with the same length as, and all elements copied from, the given array.

 

Method Summary
int	addAndGet(int i, int delta)           Atomically adds the given value to the element at index i.
boolean	compareAndSet(int i, int expect, int update)           Atomically sets the element at position i to the given updated value if the current value == the expected value.
int	decrementAndGet(int i)           Atomically decrements by one the element at index i.
int	get(int i)           Gets the current value at position i.
int	getAndAdd(int i, int delta)           Atomically adds the given value to the element at index i.
int	getAndDecrement(int i)           Atomically decrements by one the element at index i.
int	getAndIncrement(int i)           Atomically increments by one the element at index i.
int	getAndSet(int i, int newValue)           Atomically sets the element at position i to the given value and returns the old value.
int	incrementAndGet(int i)           Atomically increments by one the element at index i.
void	lazySet(int i, int newValue)           Eventually sets the element at position i to the given value.
int	length()           Returns the length of the array.
void	set(int i, int 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, int expect, int 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

AtomicIntegerArray

public AtomicIntegerArray(int length)

Creates a new AtomicIntegerArray of given length.

Parameters:

length - the length of the array

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AtomicIntegerArray

public AtomicIntegerArray(int[] array)

Creates a new AtomicIntegerArray 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 int 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,
                      int 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,
                          int 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 int getAndSet(int i,
                           int 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,
                                   int expect,
                                   int 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,
                                       int expect,
                                       int 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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getAndIncrement

public final int getAndIncrement(int i)

Atomically increments by one the element at index i.

Parameters:

i - the index

Returns:

the previous value

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getAndDecrement

public final int getAndDecrement(int i)

Atomically decrements by one the element at index i.

Parameters:

i - the index

Returns:

the previous value

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getAndAdd

public final int getAndAdd(int i,
                           int delta)

Atomically adds the given value to the element at index i.

Parameters:

i - the index

delta - the value to add

Returns:

the previous value

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incrementAndGet

public final int incrementAndGet(int i)

Atomically increments by one the element at index i.

Parameters:

i - the index

Returns:

the updated value

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decrementAndGet

public final int decrementAndGet(int i)

Atomically decrements by one the element at index i.

Parameters:

i - the index

Returns:

the updated value

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addAndGet

public final int addAndGet(int i,
                           int delta)

Atomically adds the given value to the element at index i.

Parameters:

i - the index

delta - the value to add

Returns:

the updated value

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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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