-/* Copyright (C) 1998, 1999 Free Software Foundation
+/* Observer.java -- an object that will be informed of changes in an Observable
+ Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
- This file is part of libgcj.
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
package java.util;
-
+
/**
+ * Interface that is implemented when a class wants to be informed of changes
+ * in Observable objects.
+ *
* @author Warren Levy <warrenl@cygnus.com>
- * @date August 25, 1998.
- */
-/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
- * "The Java Language Specification", ISBN 0-201-63451-1
- * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
- * Status: Believed complete and correct
+ * @see Observable
+ * @status updated to 1.4
*/
-
public interface Observer
{
- public void update(Observable observed, Object arg);
+ /**
+ * This method is called whenever the observable object changes, and has
+ * called <code>notifyObservers</code>. The Observable object can pass
+ * arbitrary information in the second parameter.
+ *
+ * @param observable the Observable object that changed
+ * @param arg arbitrary information, usually relating to the change
+ */
+ void update(Observable observable, Object arg);
}
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