| 1 | /* Observer.java -- an object that will be informed of changes in an Observable
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| 2 | Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GNU Classpath.
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| 5 |
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| 6 | GNU Classpath is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GNU Classpath is distributed in the hope that it will be useful, but
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| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GNU Classpath; see the file COPYING. If not, write to the
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| 18 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 19 | 02111-1307 USA.
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| 20 |
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| 21 | Linking this library statically or dynamically with other modules is
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| 22 | making a combined work based on this library. Thus, the terms and
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| 23 | conditions of the GNU General Public License cover the whole
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| 24 | combination.
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| 25 |
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| 26 | As a special exception, the copyright holders of this library give you
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| 27 | permission to link this library with independent modules to produce an
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| 28 | executable, regardless of the license terms of these independent
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| 29 | modules, and to copy and distribute the resulting executable under
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| 30 | terms of your choice, provided that you also meet, for each linked
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| 31 | independent module, the terms and conditions of the license of that
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| 32 | module. An independent module is a module which is not derived from
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| 33 | or based on this library. If you modify this library, you may extend
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| 34 | this exception to your version of the library, but you are not
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| 35 | obligated to do so. If you do not wish to do so, delete this
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| 36 | exception statement from your version. */
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| 37 |
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| 38 |
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| 39 | package java.util;
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| 40 |
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| 41 | /**
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| 42 | * Interface that is implemented when a class wants to be informed of changes
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| 43 | * in Observable objects.
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| 44 | *
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| 45 | * @author Warren Levy <warrenl@cygnus.com>
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| 46 | * @see Observable
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| 47 | * @status updated to 1.4
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| 48 | */
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| 49 | public interface Observer
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| 50 | {
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| 51 | /**
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| 52 | * This method is called whenever the observable object changes, and has
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| 53 | * called <code>notifyObservers</code>. The Observable object can pass
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| 54 | * arbitrary information in the second parameter.
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| 55 | *
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| 56 | * @param observable the Observable object that changed
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| 57 | * @param arg arbitrary information, usually relating to the change
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| 58 | */
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| 59 | public void update(Observable observable, Object arg);
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| 60 | }
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