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3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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).
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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  @FunctionalInterface
38  public interface PreferenceChangeListener extends java.util.EventListener {
39      /**
40       * This method gets called when a preference is added, removed or when
41       * its value is changed.
42       * <p>
43       * @param evt A PreferenceChangeEvent object describing the event source
44       *          and the preference that has changed.
45       */
46      void preferenceChange(PreferenceChangeEvent evt);
47  }