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Ò».±àд¹¹ÔìÆ÷µÄÓÐЧ׼Ôò£º       Óþ¡¿ÉÄܼòµ¥µÄ·½·¨Ê¹¶ÔÏó½øÈëÕý³£×´Ì¬£¬Èç¹û¿ÉÒԵϰ£¬±ÜÃâµ÷ÓÃÆäËû·½·¨¡£ÔÚ¹¹ÔìÆ÷ÄÚΨһÄܹ»°²È«µ÷ÓõÄÄÇЩ·½·¨ÊÇ»ùÀàÖеÄfinal·½·¨£¨Ò²ÊÊÓÃÓÚprivate·½·¨£¬ËüÃÇ×Ô¶¯ÊôÓÚfinal·½·¨£©¡£ ¶þ.Óü̳нøÐÐÉè¼ÆµÄ×¼Ôò£º     Óü̳бí´ïÐÐΪ¼äµÄ²îÒ죬²¢ÓÃ×ֶαí´ï״̬Éϵı仯¡£ 1: class Actor {// ÄÐÑÝÔ±
2: public void act() {}
3: }
4:  
5: class HappyActor extends Actor{//¸ßÐ˵ÄÄÐÑÝÔ±
6: public void act() {System.out.println("HappyActor");}
7: }
8:  
9: class SadActor extends Actor{//±¯É˵ÄÄÐÑÝÔ±
10: @Override
11: public void act() {System.out.println("SadActor");}
12: }
13:  
14: class Stage {//Îę̀
15: private Actor actor = new HappyActor();
16: public void change(){actor= new SadActor();}
17: public void PerformPlay(){actor.act();}
18: }
19: public class Transmogrify {
20:  
21: /**
22: * Stage¶ÔÏó°üº¬Ò»¸öActor µÄÒýÓ㬶øActor±»³õʼ»¯ÎªHappyActor¶ÔÏó£¬
23: * ÕâÒâζ×ÅPerformPlay()»á²úÉúijÖÖÌØÊâÐÐΪ¡£
24: * ¼ÈÈ»ÒýÓÃÔÚÔËÐÐʱ¿ÉÒÔÓëÁíÒ»¸ö²»Í¬µÄ¶ÔÏóÖØÐÂ°ó¶¨ÆðÀ´£¬
25: * ËùÒÔSadActor¶ÔÏóµÄÒýÓÿÉÒÔÔÚActorÖб»Ìæ´ú£¬È»ºóÓÉPerformPlay()²úÉúµÄÐÐÎªÒ²ËæÖ®¸Ä±ä¡£
26: * ÕâÑùÒ»À´£¬ÎÒÃÇÔÚÔËÐÐÆÚ¼ä»ñµÃÁ˶¯Ì¬µÄÁé»îÐÔ£¨ÕâÒ²³Æ×÷"״̬ģʽ"£©
27: * @param args
28: */
29: public static void main(String[] args) {
30: Stage stage = new Stage();
31: stage.PerformPlay();
32: stage.change();
33: stage.PerformPlay();
34: }
35:
36: }/*Output:
37: HappyActor
38: SadActor*///:~
39:


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