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Added in API level 1

AtomicInteger

public class AtomicInteger
extends Number implements Serializable

java.lang.Object
   ↳ java.lang.Number
     ↳ java.util.concurrent.atomic.AtomicInteger


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.

Summary

Public constructors

AtomicInteger(int initialValue)

Creates a new AtomicInteger with the given initial value.

AtomicInteger()

Creates a new AtomicInteger with initial value 0.

Public methods

final int addAndGet(int delta)

Atomically adds the given value to the current value.

final boolean compareAndSet(int expect, int update)

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

final int decrementAndGet()

Atomically decrements by one the current value.

double doubleValue()

Returns the value of this AtomicInteger as a double after a widening primitive conversion.

float floatValue()

Returns the value of this AtomicInteger as a float after a widening primitive conversion.

final int get()

Gets the current value.

final int getAndAdd(int delta)

Atomically adds the given value to the current value.

final int getAndDecrement()

Atomically decrements by one the current value.

final int getAndIncrement()

Atomically increments by one the current value.

final int getAndSet(int newValue)

Atomically sets to the given value and returns the old value.

final int incrementAndGet()

Atomically increments by one the current value.

int intValue()

Returns the value of this AtomicInteger as an int.

final void lazySet(int newValue)

Eventually sets to the given value.

long longValue()

Returns the value of this AtomicInteger as a long after a widening primitive conversion.

final void set(int newValue)

Sets to the given value.

String toString()

Returns the String representation of the current value.

final boolean weakCompareAndSet(int expect, int update)

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

Inherited methods

From class java.lang.Number
From class java.lang.Object

Public constructors

AtomicInteger

Added in API level 1
AtomicInteger (int initialValue)

Creates a new AtomicInteger with the given initial value.

Parameters
initialValue int: the initial value

AtomicInteger

Added in API level 1
AtomicInteger ()

Creates a new AtomicInteger with initial value 0.

Public methods

addAndGet

Added in API level 1
int addAndGet (int delta)

Atomically adds the given value to the current value.

Parameters
delta int: the value to add
Returns
int the updated value

compareAndSet

Added in API level 1
boolean compareAndSet (int expect, 
                int update)

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

Parameters
expect int: the expected value
update int: the new value
Returns
boolean true if successful. False return indicates that the actual value was not equal to the expected value.

decrementAndGet

Added in API level 1
int decrementAndGet ()

Atomically decrements by one the current value.

Returns
int the updated value

doubleValue

Added in API level 1
double doubleValue ()

Returns the value of this AtomicInteger as a double after a widening primitive conversion.

Returns
double the primitive double value of this object.

floatValue

Added in API level 1
float floatValue ()

Returns the value of this AtomicInteger as a float after a widening primitive conversion.

Returns
float the primitive float value of this object.

get

Added in API level 1
int get ()

Gets the current value.

Returns
int the current value

getAndAdd

Added in API level 1
int getAndAdd (int delta)

Atomically adds the given value to the current value.

Parameters
delta int: the value to add
Returns
int the previous value

getAndDecrement

Added in API level 1
int getAndDecrement ()

Atomically decrements by one the current value.

Returns
int the previous value

getAndIncrement

Added in API level 1
int getAndIncrement ()

Atomically increments by one the current value.

Returns
int the previous value

getAndSet

Added in API level 1
int getAndSet (int newValue)

Atomically sets to the given value and returns the old value.

Parameters
newValue int: the new value
Returns
int the previous value

incrementAndGet

Added in API level 1
int incrementAndGet ()

Atomically increments by one the current value.

Returns
int the updated value

intValue

Added in API level 1
int intValue ()

Returns the value of this AtomicInteger as an int.

Returns
int the primitive int value of this object.

lazySet

Added in API level 9
void lazySet (int newValue)

Eventually sets to the given value.

Parameters
newValue int: the new value

longValue

Added in API level 1
long longValue ()

Returns the value of this AtomicInteger as a long after a widening primitive conversion.

Returns
long the primitive long value of this object.

set

Added in API level 1
void set (int newValue)

Sets to the given value.

Parameters
newValue int: the new value

toString

Added in API level 1
String toString ()

Returns the String representation of the current value.

Returns
String the String representation of the current value

weakCompareAndSet

Added in API level 1
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.

Parameters
expect int: the expected value
update int: the new value
Returns
boolean true if successful
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