Java.beans.PropertyChangeListener

1 Importjava.beans.PropertyChangeEvent;2 ImportJava.beans.PropertyChangeListener;3 ImportJava.beans.PropertyChangeSupport;4 5  Public classDemobeans {6   7     PrivateString Demoname; 8     PrivateString Version; 9Propertychangesupport listeners =NewPropertychangesupport ( This); Ten    One      PublicDemobeans () { ADemoname = "InitValue";  -version= "v1000"; -     }   the    -    -      PublicString Getdemoname () { -         returnDemoname;  +     }   -        +    A      Public voidsetdemoname (String demoname) { atString OldValue = This. Demoname;  -          This. Demoname =Demoname;  -         //Release Listener Events -Firepropertychange ("Demoname", OldValue, demoname);  -            -     }   in        -      Public voidsetdemoversion (String demoversion) { toString oldversion = This.  Version;  +          This. Version =demoversion;  -         //Release Listener Events theFirepropertychange ("Demoversion", Oldversion, demoversion);  *            $     }  Panax Notoginseng      Public voidAddpropertychangelistener (PropertyChangeListener listener) { - Listeners.addpropertychangelistener (listener);  the     }   +        A      Public voidRemovepropertychangelistener (PropertyChangeListener listener) { the Listeners.addpropertychangelistener (listener);  +     }   -        $    $     /**  - * Events that trigger attribute changes -      */   the     protected voidFirepropertychange (String prop, Object OldValue, Object newvalue) { - Listeners.firepropertychange (prop, OldValue, newvalue); Wuyi     }   the      Public Static voidMain (string[] args) { -Demobeans beans =NewDemobeans ();  Wu          - Beans.addpropertychangelistener ( About                 NewPropertyChangeListener () { $              Public voidPropertyChange (propertychangeevent evt) { -                  if(Evt.getpropertyname (). Equals ("Demoversion")){ -System.out.println ("Version_oldvalue:" +Evt.getoldvalue ());  -System.out.println ("Version_newvalue:" +Evt.getnewvalue ());  ASystem.out.println ("Version_tpropertyname:" +evt.getpropertyname ()); +                  } the                  Else -                  { $System.out.println ("Name_oldvalue:" +Evt.getoldvalue ());  theSystem.out.println ("Name_newvalue:" +Evt.getnewvalue ());  theSystem.out.println ("Name_tpropertyname:" +evt.getpropertyname ()); the                  } the                    -             }});  in  the          theBeans.setdemoname ("Test");  AboutBeans.setdemoversion ("v2000"); the        the     }    the}

Java.beans.PropertyChangeListener