1 import java.util.ArrayList;  2   3 class Manager  4 {  5     private String name; //经理的名字  6     public Manager(String string) {  7         name=string;  8     }  9     public void update(String id) 10     { 11         System.out.println("哈哈"+id+"房子已经被买了，好开心"); 12     } 13      14      15 } 16 //抽象房子 17 abstract class House 18 { 19     private String id; 20     private int price; 21     private int  status=0;// status=0没有被卖掉 22     private ArrayList<Manager> m=new ArrayList<Manager>(); 23     public void setStatus() 24     { 25         status=1;   //卖房子了 26         for(Manager ma:m) 27         { 28         ma.update(id); 29         } 30     } 31     public House(String id,int price) 32     { 33         this.id=id; 34         this.price=price; 35     } 36     public  void addObserver(Manager ma) 37     { 38         m.add(ma); 39     } 40      41      42 } 43 //具体房子 44 class BigHouse extends House 45 { 46     public BigHouse(String id, int price) { 47         super(id, price); 48         // TODO Auto-generated constructor stub 49     } 50  51     public void method() 52     { 53         System.out.println("BigHouse"); 54          55     } 56 } 57 //具体房子 58 class smallHouse extends House 59 { 60      61     public smallHouse(String id, int price) { 62         super(id, price); 63         // TODO Auto-generated constructor stub 64     } 65  66     public void met() 67     { 68         System.out.println("smallHouse"); 69     } 70 } 71 //工厂接口 72 interface factory 73 { 74     public House getInstance(String id,int price); 75      76 } 77 //大房子工厂 78 class BigFactory implements factory 79 { 80  81     @Override 82     public House getInstance(String id, int price) { 83         // TODO Auto-generated method stub 84         return new BigHouse(id,price); 85     } 86  87      88 } 89 class smallFactory implements factory 90 { 91  92     @Override 93     public House getInstance(String id, int price) { 94         // TODO Auto-generated method stub 95         return new smallHouse(id,price); 96     } 97  98      99     100 }101 102 103 public class 设计模式1 {104 105     /**106      * @param args107      */108     public static void main(String[] args) {109         // TODO Auto-generated method stub110     //创建一大房子对象111     House h1=new BigFactory().getInstance("0001", 10000000);112     //一个小房子对象113     ((BigHouse) h1).method();114     House h2=new smallFactory().getInstance("333", 100);115     Manager ma=new Manager("zhangsan");116     h2.addObserver(ma);117     h2.setStatus();118     119     120     121     122     123     //卖掉124     125     126 127         128     }129 130 }