/*

 * 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);

    }

}