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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
/**
* 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.
*
* <p> Suppose that the garbage collector determines at a certain point in time
* that an object is <a href="package-summary.html#reachability">weakly
* reachable</a>. 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<T> extends Reference<T> {
Creates a new weak reference that refers to the given object. The new
reference is not registered with any queue.
Params: - referent – object the new weak reference will refer to
/**
* Creates a new weak reference that refers to the given object. The new
* reference is not registered with any queue.
*
* @param referent object the new weak reference will refer to
*/
public WeakReference(T referent) {
super(referent);
}
Creates a new weak reference that refers to the given object and is
registered with the given queue.
Params: - referent – object the new weak reference will refer to
- q – the queue with which the reference is to be registered,
or null if registration is not required
/**
* Creates a new weak reference that refers to the given object and is
* registered with the given queue.
*
* @param referent object the new weak reference will refer to
* @param q the queue with which the reference is to be registered,
* or <tt>null</tt> if registration is not required
*/
public WeakReference(T referent, ReferenceQueue<? super T> q) {
super(referent, q);
}
}