Android

java.util.concurrent.atomic.AtomicLong

java.lang.Object
java.lang.Number Serializable
java.util.concurrent.atomic.AtomicLong Serializable

A long value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicLong is used in applications such as atomically incremented sequence numbers, and cannot be used as a replacement for a Long. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

Summary

Public Constructors

            AtomicLong(long initialValue)
Create a new AtomicLong with the given initial value.
            AtomicLong()
Create a new AtomicLong with initial value 0.

Public Methods

    final      long  addAndGet(long delta)
Atomically add the given value to current value.
    final      boolean  compareAndSet(long expect, long update)
Atomically set the value to the given updated value if the current value == the expected value.
    final      long  decrementAndGet()
Atomically decrement by one the current value.
          double  doubleValue()
Returns the double value which the receiver represents
          float  floatValue()
Returns the float value which the receiver represents
    final      long  get()
Get the current value.
    final      long  getAndAdd(long delta)
Atomically add the given value to current value.
    final      long  getAndDecrement()
Atomically decrement by one the current value.
    final      long  getAndIncrement()
Atomically increment by one the current value.
    final      long  getAndSet(long newValue)
Set to the give value and return the old value.
    final      long  incrementAndGet()
Atomically increment by one the current value.
          int  intValue()
Returns the int value which the receiver represents
          long  longValue()
Returns the long value which the receiver represents
    final      void  set(long newValue)
Set to the given value.
          String  toString()
Returns the String representation of the current value.
    final      boolean  weakCompareAndSet(long expect, long update)
Atomically set the value to the given updated value if the current value == the expected value.
Methods inherited from class java.lang.Number
Methods inherited from class java.lang.Object

Details

Public Constructors

public AtomicLong(long initialValue)

Create a new AtomicLong with the given initial value.

Parameters

initialValue the initial value

public AtomicLong()

Create a new AtomicLong with initial value 0.

Public Methods

public final long addAndGet(long delta)

Atomically add the given value to current value.

Parameters

delta the value to add

Returns

  • the updated value

public final boolean compareAndSet(long expect, long update)

Atomically set the value to the given updated value if the current value == the expected value.

Parameters

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.

public final long decrementAndGet()

Atomically decrement by one the current value.

Returns

  • the updated value

public double doubleValue()

Returns the double value which the receiver represents

Returns

  • double the value of the receiver.

public float floatValue()

Returns the float value which the receiver represents

Returns

  • float the value of the receiver.

public final long get()

Get the current value.

Returns

  • the current value

public final long getAndAdd(long delta)

Atomically add the given value to current value.

Parameters

delta the value to add

Returns

  • the previous value

public final long getAndDecrement()

Atomically decrement by one the current value.

Returns

  • the previous value

public final long getAndIncrement()

Atomically increment by one the current value.

Returns

  • the previous value

public final long getAndSet(long newValue)

Set to the give value and return the old value.

Parameters

newValue the new value

Returns

  • the previous value

public final long incrementAndGet()

Atomically increment by one the current value.

Returns

  • the updated value

public int intValue()

Returns the int value which the receiver represents

Returns

  • int the value of the receiver.

public long longValue()

Returns the long value which the receiver represents

Returns

  • long the value of the receiver.

public final void set(long newValue)

Set to the given value.

Parameters

newValue the new value

public String toString()

Returns the String representation of the current value.

Returns

  • the String representation of the current value.

public final boolean weakCompareAndSet(long expect, long update)

Atomically set the value to the given updated value if the current value == the expected value. May fail spuriously.

Parameters

expect the expected value
update the new value

Returns

  • true if successful.
Copyright 2007 Google Inc. Build 0.9_r1-98467 - 14 Aug 2008 18:56