Examples of java.lang.ref.WeakReference

java.lang.ref.WeakReference
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. @version 1.19, 11/17/05 @author Mark Reinhold @since 1.2

        inputContextLock = new Object();


        // Deserialized Windows are not yet visible.
        visible = false;


        weakThis = new WeakReference(this);


        anchor = new Object();
        sun.java2d.Disposer.addRecord(anchor, new WindowDisposerRecord(appContext, this));


        addToWindowList();

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  Reference ref = null;
  if (obj != null) {
      if (soft) {
    ref = new SoftReference(obj);
      } else {
    ref = new WeakReference(obj);
      }
  }
  return ref;
    }

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  }
  paramNames = new String[param.length];
  params = new ArrayList(param.length);
  for (int i = 0; i < param.length; i++) {
      paramNames[i] = param[i].getName();
      params.add(new WeakReference(param[i]));
  }
    }

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    // of loading 2 classes in the same VM with the same name
    // and identityHashCode should be nearly impossible.
      }
      // Note: Use a weak reference to avoid holding on to extra
      // objects and classes after they should be unloaded.
      identitymap.put(identity, new WeakReference(k));
  }

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        Document doc = node.getOwnerDocument();
        if (doc == null) {
            doc = (Document) node;
        }
        synchronized (doc) {
            WeakReference ref = (WeakReference) xpathSupportMap.get(doc);
            if (ref != null) {
                xps = (XPathSupport) ref.get();
            }
            if (xps == null) {
                try {
                    xps = (XPathSupport) xpathSupportClass.newInstance();
                    xpathSupportMap.put(doc, new WeakReference(xps));
                } catch (Exception e) {
                    logger.error("Error instantiating xpathSupport class", e);
                }                
            }
        }

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            // 5a. Create a new entry for the field
            col = new LinkedList();
            knownFieldReferences.put( key, col );
          }
          // 6. Add a reference to cls to the entry
          col.add( new WeakReference( cls ) );
        }


        // The lines below will be used for the implementation of
        // Method call join points
        //

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  /* (non-Javadoc)
   * @see java.util.Set#contains(java.lang.Object)
   */
  public boolean contains(Object o) {
    WeakReference wr = new WeakReference(o);
    return realSet.contains(wr);
  }

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      private Iterator realIter = realSet.iterator();
      public boolean hasNext() {
        return realIter.hasNext();
      }
      public Object next() {
        WeakReference wr = (WeakReference) realIter.next();
        return wr.get();
      }
      public void remove() {
        throw new UnsupportedOperationException();
      }
    };

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   * duplicate elements.
   * 
   * @see java.util.Set#add
   */
  public boolean add(Object o) {
    WeakReference wr = new WeakReference(o);
    return realSet.add(wr);
  }

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   *       is not supported by the underlying set.
   * 
   * @see java.util.Set#remove(java.lang.Object)
   */
  public boolean remove(Object o) {
    WeakReference wr = new WeakReference(o);
    return realSet.remove(wr);
  }

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