TopBlend: Here is the first difference. There are 2 differences. is old. is new.

java.util.concurrent.atomic
Class AtomicReference<V>


java.lang.Object
  extended by java.util.concurrent.atomic.AtomicReference<V>
Type Parameters:
V - The type of object referred to by this reference
All Implemented Interfaces:
Serializable 
public class AtomicReference<V>
extends Object
implements Serializable

An object reference that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

Since:
1.5
See Also:
Serialized Form

Constructor Summary
AtomicReference ()
          Creates a new AtomicReference with null initial value.
AtomicReference ( V  initialValue)
          Creates a new AtomicReference with the given initial value.
 
Method Summary
 boolean compareAndSet ( V  expect, V
          Atomically sets the value to the given updated value if the current value == the expected value.
  V get ()
          Gets the current value.
  V getAndSet ( V  newValue)
          Atomically sets to the given value and returns the old value.
 void lazySet ( V  newValue)
          Eventually sets to the given value.
 void set ( V  newValue)
          Sets to the given value.
  String toString ()
          Returns the String representation of the current value.
 boolean weakCompareAndSet ( V  expect, V
          Atomically sets the value to the given updated value if the current value == the expected value.
 
Methods inherited from class java.lang. Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait
 

Constructor Detail

AtomicReference


public AtomicReference(V initialValue)
Creates a new AtomicReference with the given initial value.

Parameters:
initialValue - the initial value

AtomicReference


public AtomicReference()
Creates a new AtomicReference with null initial value.

Method Detail

get


public final V get()
Gets the current value.

Returns:
the current value

set


public final void set(V newValue)
Sets to the given value.

Parameters:
newValue - the new value

lazySet


public final void lazySet(V newValue)
Eventually sets to the given value.

Parameters:
newValue - the new value
Since:
1.6

compareAndSet


public final boolean compareAndSet(V expect,
                                   V update)
Atomically sets the value to the given updated value if the current value == the expected value.

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

weakCompareAndSet


public final boolean weakCompareAndSet(V expect,
                                       V update)
Atomically sets the value to the given updated value if the current value == the expected value. May fail spuriously.

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

Parameters:
expect - the expected value
update - the new value
Returns:
true if successful.

getAndSet


public final V getAndSet(V newValue)
Atomically sets to the given value and returns the old value.

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

toString


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

Overrides:
toString in class Object
Returns:
the String representation of the current value.