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package java.lang.ref;


/**
 * Weak reference objects, which do not prevent their referents from being
 * made finalizable, finalized, and then reclaimed.  Weak references are most
 * often used to implement canonicalizing mappings.
 *
 * 

Suppose that the garbage collector determines at a certain point in time * that an object is weakly * reachable. At that time it will atomically clear all weak references to * that object and all weak references to any other weakly-reachable objects * from which that object is reachable through a chain of strong and soft * references. At the same time it will declare all of the formerly * weakly-reachable objects to be finalizable. At the same time or at some * later time it will enqueue those newly-cleared weak references that are * registered with reference queues. * * @author Mark Reinhold * @since 1.2 */ public class WeakReference extends Reference { }





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