Examples of java.util.prefs.Preferences.addPreferenceChangeListener()

java.util.prefs.Preferences.addPreferenceChangeListener()
Registers the specified listener to receive preference change events for this preference node. A preference change event is generated when a preference is added to this node, removed from this node, or when the value associated with a preference is changed. (Preference change events are not generated by the {@link #removeNode()} method, which generates a node change event.Preference change events are generated by the clear method.)
Events are only guaranteed for changes made within the same JVM as the registered listener, though some implementations may generate events for changes made outside this JVM. Events may be generated before the changes have been made persistent. Events are not generated when preferences are modified in descendants of this node; a caller desiring such events must register with each descendant. @param pcl The preference change listener to add. @throws NullPointerException if pcl is null. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method. @see #removePreferenceChangeListener(PreferenceChangeListener) @see #addNodeChangeListener(NodeChangeListener)

        }
    }


    private void installPreferenceListener() {
        Preferences preferences = Preferences.userNodeForPackage(RSTAEditor.class);
        preferences.addPreferenceChangeListener(this);
    }


    private void setupGutterListener(Gutter gutter) {
        Component[] components = gutter.getComponents();
        for (Component component : components) {

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        try {
            p.removeNode();
        } catch (BackingStoreException e2) {
        }
        p.addNodeChangeListener(null);
        p.addPreferenceChangeListener(null);
        p.removeNodeChangeListener(null);
        p.removePreferenceChangeListener(null);
        try {
            p.sync();
        } catch (BackingStoreException e3) {

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  @Test
  public void testAddPreferenceChangeListenerPreferenceChangeListener() {
    final SynchronousQueue<Boolean> done = new SynchronousQueue<Boolean>();
    final String key = "testAddPreferenceChangeListenerPreferenceChangeListener";
    Preferences prefs = getCPRoot().node("testAddPreferenceChangeListener");
    prefs.addPreferenceChangeListener(new PreferenceChangeListener() {


      public void preferenceChange(PreferenceChangeEvent evt) {
        assertEquals(key, evt.getKey());
        assertEquals("Bar", evt.getNewValue());
        try {

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        } catch (InterruptedException e) {
          e.printStackTrace();
          fail();
        }
      }};
    prefs.addPreferenceChangeListener(pcl);
    prefs.put(key, "Bar");
    try {
      assertTrue(done.poll(1, TimeUnit.SECONDS));
    } catch (InterruptedException e) {
      e.printStackTrace();

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