/* * Copyright (C) 2006-2007 Sun Microsystems, Inc. All rights reserved. Use is * subject to license terms. */package org.jdesktop.observablecollections;import java.util.Map;/** * A {@code Map} that notifies listeners of changes to the {@code Map}. * * @author sky */public interface ObservableMap<K,V> extends Map<K,V> {    /**     * Adds a listener to this observable map.     *     * @param listener the listener to add     */    public void addObservableMapListener(ObservableMapListener listener);    /**     * Removes a listener from this observable map.     *     * @param listener the listener to remove     */    public void removeObservableMapListener(ObservableMapListener listener);}