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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 | } | ||