Uses of Package
java.lang.ref

• Packages that usejava.lang.ref 

  Package	Description
  java.lang.ref	Provides reference-object classes, which support a limited degree of interaction with the garbage collector.

• Classes injava.lang.ref used byjava.lang.ref 

  Class	Description
  Cleaner	Cleaner manages a set of object references and corresponding cleaning actions.
  Cleaner.Cleanable	Cleanable represents an object and a cleaning action registered in aCleaner.
  Reference	Abstract base class for reference objects.
  ReferenceQueue	Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.