1   /*
    2    * Copyright (c) 2000, 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   
   26   package java.util.prefs;
   27   
   28   /**
   29    * A listener for receiving preference change events.
   30    *
   31    * @author  Josh Bloch
   32    * @see Preferences
   33    * @see PreferenceChangeEvent
   34    * @see NodeChangeListener
   35    * @since   1.4
   36    */
   37   public interface PreferenceChangeListener extends java.util.EventListener {
   38       /**
   39        * This method gets called when a preference is added, removed or when
   40        * its value is changed.
   41        * <p>
   42        * @param evt A PreferenceChangeEvent object describing the event source
   43        *          and the preference that has changed.
   44        */
   45       void preferenceChange(PreferenceChangeEvent evt);
   46   }