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public interface InterestingEvent {
¡¡¡¡ public void interestingEvent();  //ÆäËü·½·¨Ìå¼°·½·¨¶¨ÒåÒ²¿É£®
}
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public class CallMe implements InterestingEvent {
        public CallMe() {
¡¡¡¡ }
¡¡¡¡ public void interestingEvent() {
     ¡¡¡¡ System.out.println("·¢ÉúÁËCallMeʼþ£¬¹þ¹þ");
 ¡¡¡¡}
}
public class CallYou implements InterestingEvent {
       public CallYou() {
  ¡¡ }
       public void interestingEvent() {  
             System.out.println("·¢ÉúÁËCallYouʼþ£¬¹þ¹þ");
      }
}
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public class EventNotifier {
     private InterestingEvent ie;   //½Ó¿Ú¶ÔÏóÒýÓÃ
     private boolean somethingHappened ;
     public EventNotifier() {
             somethingHappened = true ;
      }
      public void setInterestingEvent(InterestingEvent ie){   //²ÎÊýÒýÓø½Öµ
           this.ie = ie ;
       }
    


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