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| 1 | +/* | |
| 2 | + * Copyright (c) 1994, 1998, 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 | +package java.util; | |
| 26 | + | |
| 27 | +/** | |
| 28 | + * A class can implement the <code>Observer</code> interface when it | |
| 29 | + * wants to be informed of changes in observable objects. | |
| 30 | + * | |
| 31 | + * @author Chris Warth | |
| 32 | + * @see java.util.Observable | |
| 33 | + * @since JDK1.0 | |
| 34 | + */ | |
| 35 | +public interface Observer { | |
| 36 | + /** | |
| 37 | + * This method is called whenever the observed object is changed. An | |
| 38 | + * application calls an <tt>Observable</tt> object's | |
| 39 | + * <code>notifyObservers</code> method to have all the object's | |
| 40 | + * observers notified of the change. | |
| 41 | + * | |
| 42 | + * @param o the observable object. | |
| 43 | + * @param arg an argument passed to the <code>notifyObservers</code> | |
| 44 | + * method. | |
| 45 | + */ | |
| 46 | + void update(Observable o, Object arg); | |
| 47 | +} | |