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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   }

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