JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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package javax.swing;

import javax.swing.event.*;

/**
 * A model that supports at most one indexed selection.
 *
 * @author Dave Moore
 * @since 1.2
 */
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

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