外观模式

 1 public class Facade
 2 {
 3     private SubSystemA obj1 = new SubSystemA();
 4     private SubSystemB obj2 = new SubSystemB();
 5     private SubSystemC obj3 = new SubSystemC();
 6     public void method()
 7     {
 8         obj1.method();
 9         obj2.method();
10         obj3.method();
11     }
12 } 

  1 //外观角色类
  2 public class GeneralSwitchFacade {
  3     private Light lights[]=new Light[4];
  4     private Fan fan;
  5     private AirConditioner ac;
  6     private Television tv;
  7     
  8     public GeneralSwitchFacade()
  9     {
 10         lights[0]=new Light("左前");
 11         lights[1]=new Light("右前");
 12         lights[2]=new Light("左后");
 13         lights[3]=new Light("右后");    
 14         fan=new Fan();
 15         ac=new AirConditioner();
 16         tv=new Television();
 17     }
 18     
 19     public void on()
 20     {
 21         lights[0].on();
 22         lights[1].on();
 23         lights[2].on();
 24         lights[3].on();
 25         fan.on();
 26         ac.on();
 27         tv.on();
 28     } 
 29         
 30     public void off()
 31     {
 32         lights[0].off();
 33         lights[1].off();
 34         lights[2].off();
 35         lights[3].off();
 36         fan.off();
 37         ac.off();
 38         tv.off();        
 39     }   
 40 }
 41 
 42 //子系统角色类
 43 public class Light
 44 {
 45     private String position;
 46     
 47     public Light(String position)
 48     {
 49         this.position=position;    
 50     }
 51     
 52     public void on()
 53     {
 54         System.out.println(this.position + "灯打开！");
 55     }
 56     
 57     public void off()
 58     {
 59         System.out.println(this.position + "灯关闭！");    
 60     }
 61 }
 62 
 63 //子系统角色
 64 public class Fan
 65 {
 66     public void on()
 67     {
 68         System.out.println("风扇打开！");    
 69     }
 70     
 71     public void off()
 72     {
 73         System.out.println("风扇关闭！");        
 74     }
 75 }
 76 
 77 //子系统角色
 78 public class AirConditioner
 79 {
 80     public void on()
 81     {
 82         System.out.println("空调打开！");
 83     }
 84     
 85     public void off()
 86     {
 87         System.out.println("空调关闭！");
 88     }
 89 }
 90 
 91 //子系统角色
 92 public class Television
 93 {
 94     public void on()
 95     {
 96         System.out.println("电视机打开！");
 97     }
 98     
 99     public void off()
100     {
101         System.out.println("电视机关闭！");    
102     }
103 }
104 
105 //客户端
106 public class Client
107 {
108     public static void main(String args[])
109     {
110         GeneralSwitchFacade gsf=new GeneralSwitchFacade();
111         gsf.on();
112         System.out.println("-----------------------");    
113         gsf.off();
114     }
115 }

 1 public class JDBCFacade {
 2     private Connection conn=null;
 3     private Statement statement=null;
 4     public void open(String driver,String jdbcUrl,String userName,String userPwd) {
 5        ......
 6     }
 7     public int executeUpdate(String sql) {
 8         ......
 9     }
10     public ResultSet executeQuery(String sql) {
11         ......
12     }
13     public void close() {
14         ......
15     }
16 }