java类库详细讲解
源代码在线查看： weakref.html
Determining When an Object Is No Longer Used
(Java Developers Almanac Example)
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The Java Developers Almanac 1.4
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[3 examples]
e107.
Determining When an Object Is No Longer Used
A weak reference is used to determine when an object
is no longer being referenced.
// Create the weak reference.
ReferenceQueue rq = new ReferenceQueue();
WeakReference wr = new WeakReference(object, rq);
// Wait for all the references to the object.
try {
while (true) {
Reference r = rq.remove();
if (r == wr) {
// Object is no longer referenced.
}
}
} catch (InterruptedException e) {
}
Related Examples
e106.
Holding onto an Object Until Memory Becomes Low
e108.
Determining When an Object Will Be Reclaimed
© 2002 Addison-Wesley.
