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This
abstract class represents some type of indirect reference to a
referent. get( ) returns the
referent if the reference has not been explicitly cleared by the
clear( ) method or
implicitly cleared by the garbage collector. There are three concrete
subclasses of Reference. The garbage collector
handles these subclasses differently and clears their references
under different circumstances.Each of the subclasses of
Reference defines a constructor that allows a
ReferenceQueue to be associated with the
Reference object. The garbage collector places
Reference objects onto their associated
ReferenceQueue objects to provide notification
about the state of the referent object. isEnqueued(
) tests whether a Reference has been
placed on the associated queue, and enqueue( )
explicitly places it on the queue. enqueue( )
returns false if the Reference
object does not have an associated ReferenceQueue,
or if it has already been enqueued.
public abstract class Reference<T> {
// No Constructor
// Public Instance Methods
public void clear ( );
public boolean enqueue ( );
public T get ( );
public boolean isEnqueued ( );
}Subclasses
PhantomReference,
SoftReference, WeakReference
Returned By
ReferenceQueue.{poll( ), remove(
)}
