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   * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package java.lang.ref;
  
  
  /**
   * 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.
   *
   * <p> Suppose that the garbage collector determines at a certain point in time
   * that an object is <a href="package-summary.html#reachability">weakly
   * reachable</a>.  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.
   *
   * @author   Mark Reinhold
   * @since    1.2
   */
  
  public class WeakReference<T> extends Reference<T> {
  
      /**
       * Creates a new weak reference that refers to the given object.  The new
       * reference is not registered with any queue.
       *
       * @param referent object the new weak reference will refer to
       */
      public WeakReference(T referent) {
          super(referent);
      }
  
      /**
       * Creates a new weak reference that refers to the given object and is
       * registered with the given queue.
       *
       * @param referent object the new weak reference will refer to
       * @param q the queue with which the reference is to be registered,
       *          or <tt>null</tt> if registration is not required
       */
      public WeakReference(T referent, ReferenceQueue<? super T> q) {
          super(referent, q);
      }
  
  }
  