This interface defines the methods that an object must implement if it wants to be notified when a child preferences node is added to or removed from a Preferences object. When such an addition or removal occurs, the parent Preferences object passes a NodeChangeEvent object to the appropriate method of any NodeChangeListener objects that have been registered through the Preferences.addNodeChangeListener( ) method.

Figure 16-128. java.util.prefs.NodeChangeListener

public interface NodeChangeListener extends java.util.EventListener {
// Public Instance Methods
     void childAdded(NodeChangeEvent evt);  
     void childRemoved(NodeChangeEvent evt);  
}

Passed To

AbstractPreferences.{addNodeChangeListener( ), removeNodeChangeListener( )}, Preferences.{addNodeChangeListener( ), removeNodeChangeListener( )}