AtomicReferenceArray
public
class
AtomicReferenceArray
extends Object
implements
Serializable
java.lang.Object  
↳  java.util.concurrent.atomic.AtomicReferenceArray<E> 
An array of object references in which elements may be updated
atomically. See the java.util.concurrent.atomic
package
specification for description of the properties of atomic
variables.
Summary
Public constructors  

AtomicReferenceArray(int length)
Creates a new AtomicReferenceArray of the given length, with all elements initially null. 

AtomicReferenceArray(E[] array)
Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array. 
Public methods  

final
E

accumulateAndGet(int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index 
final
boolean

compareAndSet(int i, E expect, E update)
Atomically sets the element at position 
final
E

get(int i)
Gets the current value at position 
final
E

getAndAccumulate(int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index 
final
E

getAndSet(int i, E newValue)
Atomically sets the element at position 
final
E

getAndUpdate(int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index 
final
void

lazySet(int i, E newValue)
Eventually sets the element at position 
final
int

length()
Returns the length of the array. 
final
void

set(int i, E newValue)
Sets the element at position 
String

toString()
Returns the String representation of the current values of array. 
final
E

updateAndGet(int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index 
final
boolean

weakCompareAndSet(int i, E expect, E update)
Atomically sets the element at position 
Inherited methods  

Public constructors
AtomicReferenceArray
AtomicReferenceArray (int length)
Creates a new AtomicReferenceArray of the given length, with all elements initially null.
Parameters  

length 
int : the length of the array

AtomicReferenceArray
AtomicReferenceArray (E[] array)
Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.
Parameters  

array 
E : the array to copy elements from 
Throws  

NullPointerException 
if array is null 
Public methods
accumulateAndGet
E accumulateAndGet (int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index i
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 at index i
as its first
argument, and the given update as the second argument.
Parameters  

i 
int : the index 
x 
E : the update value 
accumulatorFunction 
BinaryOperator : a sideeffectfree function of two arguments 
Returns  

E 
the updated value 
compareAndSet
boolean compareAndSet (int i, E expect, E update)
Atomically sets the element at position i
to the given
updated value if the current value ==
the expected value.
Parameters  

i 
int : the index 
expect 
E : the expected value 
update 
E : the new value 
Returns  

boolean 
true if successful. False return indicates that
the actual value was not equal to the expected value.

get
E get (int i)
Gets the current value at position i
.
Parameters  

i 
int : the index 
Returns  

E 
the current value 
getAndAccumulate
E getAndAccumulate (int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index i
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 at index i
as its first
argument, and the given update as the second argument.
Parameters  

i 
int : the index 
x 
E : the update value 
accumulatorFunction 
BinaryOperator : a sideeffectfree function of two arguments 
Returns  

E 
the previous value 
getAndSet
E getAndSet (int i, E newValue)
Atomically sets the element at position i
to the given
value and returns the old value.
Parameters  

i 
int : the index 
newValue 
E : the new value 
Returns  

E 
the previous value 
getAndUpdate
E getAndUpdate (int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index i
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  

i 
int : the index 
updateFunction 
UnaryOperator : a sideeffectfree function 
Returns  

E 
the previous value 
lazySet
void lazySet (int i, E newValue)
Eventually sets the element at position i
to the given value.
Parameters  

i 
int : the index 
newValue 
E : the new value 
length
int length ()
Returns the length of the array.
Returns  

int 
the length of the array 
set
void set (int i, E newValue)
Sets the element at position i
to the given value.
Parameters  

i 
int : the index 
newValue 
E : the new value

toString
String toString ()
Returns the String representation of the current values of array.
Returns  

String 
the String representation of the current values of array 
updateAndGet
E updateAndGet (int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index i
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  

i 
int : the index 
updateFunction 
UnaryOperator : a sideeffectfree function 
Returns  

E 
the updated value 
weakCompareAndSet
boolean weakCompareAndSet (int i, E expect, E update)
Atomically sets the element at position i
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  

i 
int : the index 
expect 
E : the expected value 
update 
E : the new value 
Returns  

boolean 
true if successful
