重载Finalize引发的内存泄露

public final class FinalizerReference<T> extends Reference<T> {
    // This queue contains those objects eligible for finalization. public static final ReferenceQueue queue = new ReferenceQueue();

   ..............
   ..............

    // When the GC wants something finalized, it moves it from the 'referent' field to // the 'zombie' field instead. private T zombie;

    public FinalizerReference(T r, ReferenceQueue<? super T> q) {
        super(r, q);
    }

    @Override public T get() {
        return zombie;
    }

    @Override public void clear() {
        zombie = null;
    }

    public static void add(Object referent) {
        FinalizerReference<?> reference = new FinalizerReference(referent, queue);
        synchronized (LIST_LOCK) {
            reference.prev = null;
            reference.next = head;
            if (head != null) {
                head.prev = reference;
            }
            head = reference;
        }
    }

    public static void remove(FinalizerReference<?> reference) {
        synchronized (LIST_LOCK) {
            FinalizerReference<?> next = reference.next;
            FinalizerReference<?> prev = reference.prev;
            reference.next = null;
            reference.prev = null;
            if (prev != null) {
                prev.next = next;
            } else {
                head = next;
            }
            if (next != null) {
                next.prev = prev;
            }
        }
    }

public final class Daemons {

    ...
        private static class FinalizerDaemon extends Daemon {
        private static final FinalizerDaemon INSTANCE = new FinalizerDaemon();
        private final ReferenceQueue<Object> queue = FinalizerReference.queue;
        private volatile Object finalizingObject;
        private volatile long finalizingStartedNanos;

        FinalizerDaemon() {
            super("FinalizerDaemon");
        }

        @Override public void run() {
            while (isRunning()) {
                // Take a reference, blocking until one is ready or the thread should stop try {
                    doFinalize((FinalizerReference<?>) queue.remove());
                } catch (InterruptedException ignored) {
                }
            }
        }

        @FindBugsSuppressWarnings("FI_EXPLICIT_INVOCATION")
        private void doFinalize(FinalizerReference<?> reference) {
            FinalizerReference.remove(reference);
            Object object = reference.get();
            reference.clear();
            try {
                finalizingStartedNanos = System.nanoTime();
                finalizingObject = object;
                synchronized (FinalizerWatchdogDaemon.INSTANCE) {
                    FinalizerWatchdogDaemon.INSTANCE.notify();
                }
                object.finalize();
            } catch (Throwable ex) {
                // The RI silently swallows these, but Android has always logged. System.logE("Uncaught exception thrown by finalizer", ex);
            } finally {
                // Done finalizing, stop holding the object as live.
                finalizingObject = null;
            }
        }
    }

    ...
}