/* * Copyright (c) 1997, 2002, 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; import javax.swing.event.*; /** * A model that supports at most one indexed selection. * * @author Dave Moore */public interface SingleSelectionModel {    /**     * Returns the model's selection.     *     * @return  the model's selection, or -1 if there is no selection     * @see     #setSelectedIndex     */    public int getSelectedIndex();     /**     * Sets the model's selected index to <I>index</I>.     *     * Notifies any listeners if the model changes     *     * @param index an int specifying the model selection     * @see   #getSelectedIndex     * @see   #addChangeListener     */    public void setSelectedIndex(int index);     /**     * Clears the selection (to -1).     */    public void clearSelection();     /**     * Returns true if the selection model currently has a selected value.     * @return true if a value is currently selected     */    public boolean isSelected();     /**     * Adds <I>listener</I> as a listener to changes in the model.     * @param listener the ChangeListener to add     */    void addChangeListener(ChangeListener listener);     /**     * Removes <I>listener</I> as a listener to changes in the model.     * @param listener the ChangeListener to remove     */    void removeChangeListener(ChangeListener listener);}