AtomicReference JDK 1.6)

publicfinal boolean compareAndSet ( V expect, V update)

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

Atomically sets the value to the given updated value
if the current value == the expected value.
Returns: true if successful. False return indicates that the actual value was not equal to the expected value.
Parameters:
- expect - the expected value
- update - the new value

publicfinal V get ()

Gets the current value.

publicfinal V getAndSet ( V newValue)

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

publicfinal void lazySet ( V newValue)

Eventually sets to the given value.

publicfinal void set ( V newValue)

Sets to the given value.

public String toString ()

Returns the String representation of the current value.

publicfinal 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 and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.
Returns: true if successful.
Parameters:
- expect - the expected value
- update - the new value