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 numericallybased classes.
Summary
Public constructors  

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

AtomicLong()
Creates a new AtomicLong with initial value 
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 
final
long

decrementAndGet()
Atomically decrements by one the current value. 
double

doubleValue()
Returns the value of this 
float

floatValue()
Returns the value of this 
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 
final
void

lazySet(long newValue)
Eventually sets to the given value. 
long

longValue()
Returns the value of this 
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 
Inherited methods  

Public constructors
AtomicLong
public AtomicLong (long initialValue)
Creates a new AtomicLong with the given initial value.
Parameters  

initialValue 
long : the initial value

Public methods
accumulateAndGet
public 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. The function should be sideeffectfree, since it may be reapplied 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 sideeffectfree function of two arguments 
Returns  

long 
the updated value 
addAndGet
public final 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
public final 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
public final long decrementAndGet ()
Atomically decrements by one the current value.
Returns  

long 
the updated value 
doubleValue
public 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
public 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
public final long get ()
Gets the current value.
Returns  

long 
the current value 
getAndAccumulate
public 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. The function should be sideeffectfree, since it may be reapplied 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 sideeffectfree function of two arguments 
Returns  

long 
the previous value 
getAndAdd
public final 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
public final long getAndDecrement ()
Atomically decrements by one the current value.
Returns  

long 
the previous value 
getAndIncrement
public final long getAndIncrement ()
Atomically increments by one the current value.
Returns  

long 
the previous value 
getAndSet
public final 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
public final 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 sideeffectfree, since it may be reapplied when attempted updates fail due to contention among threads.
Parameters  

updateFunction 
LongUnaryOperator : a sideeffectfree function 
Returns  

long 
the previous value 
incrementAndGet
public final long incrementAndGet ()
Atomically increments by one the current value.
Returns  

long 
the updated value 
intValue
public 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
public final void lazySet (long newValue)
Eventually sets to the given value.
Parameters  

newValue 
long : the new value 
longValue
public 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
public final void set (long newValue)
Sets to the given value.
Parameters  

newValue 
long : the new value

toString
public String toString ()
Returns the String representation of the current value.
Returns  

String 
the String representation of the current value 
updateAndGet
public final 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 sideeffectfree, since it may be reapplied when attempted updates fail due to contention among threads.
Parameters  

updateFunction 
LongUnaryOperator : a sideeffectfree function 
Returns  

long 
the updated value 
weakCompareAndSet
public final 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
