Interface Summary
-------------------------
NodeChangeListener 	A listener for receiving preference node change events.
PreferenceChangeListener 	A listener for receiving preference change events.
PreferencesFactory 	A factory object that generates Preferences objects.
 
Class Summary
--------------------
AbstractPreferences 	<-- abstract class 
NodeChangeEvent
PreferenceChangeEvent
Preferences 	               <-- abstract class
 
Exception Summary
---------------------------
BackingStoreException 	Thrown to indicate that a preferences operation could not complete
because of a failure in the backing store, or a failure to contact the backing store.
InvalidPreferencesFormatException 	Thrown to indicate that an operation could not complete
because the input did not conform to the appropriate XML document type for a collection of preferences,
as per the Preferences specification.

 package  test;

 import  java.util.prefs.*;

 public   class  TestRegistry {
   public   static   void  main(String[] args) {
    Preferences p = Preferences.userRoot();
    p.put("devil sign", "666");
  }
}