[9] RFR (XS): 8169000: Define reference reachability more precisely in java.lang.ref package (original) (raw)

Fri Nov 11 15:33:21 UTC 2016

 static ReferenceQueue<Object> rq = new ReferenceQueue<>();
 static WeakReference<PhantomReference<Object>> weakRefRef;

 public static void main(final String[] args) throws Exception {
     weakRefRef = new WeakReference<>(
         new PhantomReference<>(
             new Object(),
             rq
         )
     );
     // <- here
     System.gc();
     Reference rmRef = rq.remove(1000);
     if (rmRef == null) {
         System.out.println("PhantomReference NOT enqueued");
     } else {
         System.out.println("PhantomReference enqueued");
     }
 }