Class WeakReference<T>

java.lang.Object
java.lang.ref.Reference<T>
java.lang.ref.WeakReference<T>
Type Parameters:
T - the type of the referent
public non-sealed classWeakReference<T>extendsReference<T>
Weak reference objects, which do not prevent their referents from beingmade finalizable, finalized, and then reclaimed. Weak references are mostoften used to implement canonicalizing mappings.

Suppose that the garbage collector determines at a certain point in timethat an object isweaklyreachable. At that time it will atomically clear all weak references tothat object and all weak references to any other weakly-reachable objectsfrom which that object is reachable through a chain of strong and softreferences. At the same time it will declare all of the formerlyweakly-reachable objects to be finalizable. At the same time or at somelater time it will enqueue those newly-cleared weak references that areregistered with reference queues.

Since:
1.2

  • Constructor Details

    • WeakReference

      public WeakReference(T referent)
      Creates a new weak reference that refers to the given object. The newreference is not registered with any queue.
      Parameters:
      referent - object the new weak reference will refer to

    • WeakReference

      public WeakReference(T referent,ReferenceQueue<? superT> q)
      Creates a new weak reference that refers to the given object and isregistered with the given queue.
      Parameters:
      referent - object the new weak reference will refer to
      q - the queue with which the reference is to be registered, ornull if registration is not required