1 /* 2 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /** 27 * Allows developers to provide support for undo/redo in applications such as 28 * text editors. 29 * <p> 30 * <strong>Note:</strong> 31 * Most of the Swing API is <em>not</em> thread safe. For details, see 32 * <a 33 * href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html" 34 * target="_top">Concurrency in Swing</a>, 35 * a section in 36 * <em><a href="http://docs.oracle.com/javase/tutorial/" 37 * target="_top">The Java Tutorial</a></em>. 38 * 39 * <h2>Related Documentation</h2> 40 * For overviews, tutorials, examples, guides, and tool documentation, 41 * please see: 42 * <ul> 43 * <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/components/generaltext.html#undo" 44 * target="_top">Implementing Undo and Redo</a>, 45 * a section in <em>The Java Tutorial</em></li> 46 * </ul> 47 * 48 * @since 1.2 49 * @serial exclude 50 */ 51 package javax.swing.undo;