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Added in API level 1

Summary: Ctors | Methods | Inherited Methods | [Expand All]

AtomicLong

public class AtomicLong
extends Number implements Serializable

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

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)` Creates a new AtomicLong with the given initial value.
`AtomicLong()` Creates a new AtomicLong with initial value `0`.

Public methods
`final long`	`accumulateAndGet(long x, LongBinaryOperator accumulatorFunction)` Atomically updates the current value with the results of applying the given function to the current and given values, returning the updated value.
`final long`	`addAndGet(long delta)` Atomically adds the given value to the current value.
`final boolean`	`compareAndSet(long expect, long update)` Atomically sets the value to the given updated value if the current value `==` the expected value.
`final long`	`decrementAndGet()` Atomically decrements by one the current value.
`double`	`doubleValue()` Returns the value of this `AtomicLong` as a `double` after a widening primitive conversion.
`float`	`floatValue()` Returns the value of this `AtomicLong` as a `float` after a widening primitive conversion.
`final long`	`get()` Gets the current value.
`final long`	`getAndAccumulate(long x, LongBinaryOperator accumulatorFunction)` Atomically updates the current value with the results of applying the given function to the current and given values, returning the previous value.
`final long`	`getAndAdd(long delta)` Atomically adds the given value to the current value.
`final long`	`getAndDecrement()` Atomically decrements by one the current value.
`final long`	`getAndIncrement()` Atomically increments by one the current value.
`final long`	`getAndSet(long newValue)` Atomically sets to the given value and returns the old value.
`final long`	`getAndUpdate(LongUnaryOperator updateFunction)` Atomically updates the current value with the results of applying the given function, returning the previous value.
`final long`	`incrementAndGet()` Atomically increments by one the current value.
`int`	`intValue()` Returns the value of this `AtomicLong` as an `int` after a narrowing primitive conversion.
`final void`	`lazySet(long newValue)` Eventually sets to the given value.
`long`	`longValue()` Returns the value of this `AtomicLong` as a `long`.
`final void`	`set(long newValue)` Sets to the given value.
`String`	`toString()` Returns the String representation of the current value.
`final long`	`updateAndGet(LongUnaryOperator updateFunction)` Atomically updates the current value with the results of applying the given function, returning the updated value.
`final boolean`	`weakCompareAndSet(long expect, long 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

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors

AtomicLong

Added in API level 1

AtomicLong (long initialValue)

Creates a new AtomicLong with the given initial value.

Parameters
`initialValue`	`long`: the initial value

AtomicLong

Added in API level 1

AtomicLong ()

Creates a new AtomicLong with initial value 0.

Public methods

accumulateAndGet

Added in API level 24

long accumulateAndGet (long x, 
                LongBinaryOperator accumulatorFunction)

Atomically updates the current value with the results of applying the given function to the current and given values, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

Parameters
`x`	`long`: the update value
`accumulatorFunction`	`LongBinaryOperator`: a side-effect-free function of two arguments

Returns
`long`	the updated value

addAndGet

Added in API level 1

long addAndGet (long delta)

Atomically adds the given value to the current value.

Parameters
`delta`	`long`: the value to add

Returns
`long`	the updated value

compareAndSet

Added in API level 1

boolean compareAndSet (long expect, 
                long update)

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

Parameters
`expect`	`long`: the expected value
`update`	`long`: 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

long decrementAndGet ()

Atomically decrements by one the current value.

Returns
`long`	the updated value

doubleValue

Added in API level 1

double doubleValue ()

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

Returns
`double`	the numeric value represented by this object after conversion to type `double`.

floatValue

Added in API level 1

float floatValue ()

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

Returns
`float`	the numeric value represented by this object after conversion to type `float`.

get

Added in API level 1

long get ()

Gets the current value.

Returns
`long`	the current value

getAndAccumulate

Added in API level 24

long getAndAccumulate (long x, 
                LongBinaryOperator accumulatorFunction)

Atomically updates the current value with the results of applying the given function to the current and given values, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

Parameters
`x`	`long`: the update value
`accumulatorFunction`	`LongBinaryOperator`: a side-effect-free function of two arguments

Returns
`long`	the previous value

getAndAdd

Added in API level 1

long getAndAdd (long delta)

Atomically adds the given value to the current value.

Parameters
`delta`	`long`: the value to add

Returns
`long`	the previous value

getAndDecrement

Added in API level 1

long getAndDecrement ()

Atomically decrements by one the current value.

Returns
`long`	the previous value

getAndIncrement

Added in API level 1

long getAndIncrement ()

Atomically increments by one the current value.

Returns
`long`	the previous value

getAndSet

Added in API level 1

long getAndSet (long newValue)

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

Parameters
`newValue`	`long`: the new value

Returns
`long`	the previous value

getAndUpdate

Added in API level 24

long getAndUpdate (LongUnaryOperator updateFunction)

Atomically updates the current value with the results of applying the given function, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

Parameters
`updateFunction`	`LongUnaryOperator`: a side-effect-free function

Returns
`long`	the previous value

incrementAndGet

Added in API level 1

long incrementAndGet ()

Atomically increments by one the current value.

Returns
`long`	the updated value

intValue

Added in API level 1

int intValue ()

Returns the value of this AtomicLong as an int after a narrowing primitive conversion.

Returns
`int`	the numeric value represented by this object after conversion to type `int`.

lazySet

Added in API level 9

void lazySet (long newValue)

Eventually sets to the given value.

Parameters
`newValue`	`long`: the new value

longValue

Added in API level 1

long longValue ()

Returns the value of this AtomicLong as a long. Equivalent to get().

Returns
`long`	the numeric value represented by this object after conversion to type `long`.

set

Added in API level 1

void set (long newValue)

Sets to the given value.

Parameters
`newValue`	`long`: 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

updateAndGet

Added in API level 24

long updateAndGet (LongUnaryOperator updateFunction)

Atomically updates the current value with the results of applying the given function, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

Parameters
`updateFunction`	`LongUnaryOperator`: a side-effect-free function

Returns
`long`	the updated value

weakCompareAndSet

Added in API level 1

boolean weakCompareAndSet (long expect, 
                long 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`	`long`: the expected value
`update`	`long`: the new value

Returns
`boolean`	`true` if successful