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Determining When an Object Is No Longer Used

// 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) { }