/* * Copyright (c) 1997, 2001, 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 javax.swing.plaf.basic; import sun.awt.AppContext; import javax.swing.*; import java.awt.*;import java.awt.event.*;import javax.swing.plaf.*;import java.io.Serializable;  /** * CheckboxUI implementation for BasicCheckboxUI * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing.  As of 1.4, support for long term storage * of all JavaBeans<sup><font size="-2">TM</font></sup> * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @author Jeff Dinkins */public class BasicCheckBoxUI extends BasicRadioButtonUI {     private static final Object BASIC_CHECK_BOX_UI_KEY = new Object();     private final static String propertyPrefix = "CheckBox" + ".";     // ********************************    //            Create PLAF    // ********************************    public static ComponentUI createUI(JComponent b) {        AppContext appContext = AppContext.getAppContext();        BasicCheckBoxUI checkboxUI =                (BasicCheckBoxUI) appContext.get(BASIC_CHECK_BOX_UI_KEY);        if (checkboxUI == null) {            checkboxUI = new BasicCheckBoxUI();            appContext.put(BASIC_CHECK_BOX_UI_KEY, checkboxUI);        }        return checkboxUI;    }     public String getPropertyPrefix() {        return propertyPrefix;    } }