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Java example source code file (PhantomReference.java)
The PhantomReference.java Java example source code/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package java.lang.ref; /** * Phantom reference objects, which are enqueued after the collector * determines that their referents may otherwise be reclaimed. Phantom * references are most often used for scheduling pre-mortem cleanup actions in * a more flexible way than is possible with the Java finalization mechanism. * * <p> If the garbage collector determines at a certain point in time that the * referent of a phantom reference is <a * href="package-summary.html#reachability">phantom reachable</a>, then at that * time or at some later time it will enqueue the reference. * * <p> In order to ensure that a reclaimable object remains so, the referent of * a phantom reference may not be retrieved: The <code>get method of a * phantom reference always returns <code>null. * * <p> Unlike soft and weak references, phantom references are not * automatically cleared by the garbage collector as they are enqueued. An * object that is reachable via phantom references will remain so until all * such references are cleared or themselves become unreachable. * * @author Mark Reinhold * @since 1.2 */ public class PhantomReference<T> extends Reference Other Java examples (source code examples)Here is a short list of links related to this Java PhantomReference.java source code file: |
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