java.util.concurrent.atomic
Class AtomicInteger
- Serializable
An
int value that may be updated atomically. See the
java.util.concurrent.atomic
package specification for
description of the properties of atomic variables. An
AtomicInteger is used in applications such as atomically
incremented counters, and cannot be used as a replacement for an
Integer
. However, this class does extend
Number to allow uniform access by tools and utilities that
deal with numerically-based classes.
AtomicInteger() - Creates a new AtomicInteger with initial value 0.
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AtomicInteger(int initialValue) - Creates a new AtomicInteger with the given initial value.
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int | addAndGet(int delta) - Atomically adds the given value to the current value.
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boolean | compareAndSet(int expect, int update) - Atomically sets the value to the given updated value
if the current value == the expected value.
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int | decrementAndGet() - Atomically decrements by one the current value.
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double | doubleValue()
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float | floatValue()
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int | get() - Gets the current value.
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int | getAndAdd(int delta) - Atomically adds the given value to the current value.
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int | getAndDecrement() - Atomically decrements by one the current value.
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int | getAndIncrement() - Atomically increments by one the current value.
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int | getAndSet(int newValue) - Atomically sets to the given value and returns the old value.
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int | incrementAndGet() - Atomically increments by one the current value.
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int | intValue()
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void | lazySet(int newValue) - Eventually sets to the given value.
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long | longValue()
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void | set(int newValue) - Sets to the given value.
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String | toString() - Returns the String representation of the current value.
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boolean | weakCompareAndSet(int expect, int update) - Atomically sets the value to the given updated value
if the current value == the expected value.
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clone , equals , extends Object> getClass , finalize , hashCode , notify , notifyAll , toString , wait , wait , wait |
AtomicInteger
public AtomicInteger()
Creates a new AtomicInteger with initial value 0.
AtomicInteger
public AtomicInteger(int initialValue)
Creates a new AtomicInteger with the given initial value.
initialValue
- the initial value
addAndGet
public final int addAndGet(int delta)
Atomically adds the given value to the current value.
compareAndSet
public final boolean compareAndSet(int expect,
int update)
Atomically sets the value to the given updated value
if the current value == the expected value.
expect
- the expected valueupdate
- the new value
- true if successful. False return indicates that
the actual value was not equal to the expected value.
decrementAndGet
public final int decrementAndGet()
Atomically decrements by one the current value.
get
public final int get()
Gets the current value.
getAndAdd
public final int getAndAdd(int delta)
Atomically adds the given value to the current value.
getAndDecrement
public final int getAndDecrement()
Atomically decrements by one the current value.
getAndIncrement
public final int getAndIncrement()
Atomically increments by one the current value.
getAndSet
public final int getAndSet(int newValue)
Atomically sets to the given value and returns the old value.
incrementAndGet
public final int incrementAndGet()
Atomically increments by one the current value.
lazySet
public final void lazySet(int newValue)
Eventually sets to the given value.
set
public final void set(int newValue)
Sets to the given value.
toString
public String toString()
Returns the String representation of the current value.
- toString in interface Object
- the String representation of the current value.
weakCompareAndSet
public final boolean weakCompareAndSet(int expect,
int update)
Atomically sets the value 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.
expect
- the expected valueupdate
- the new value