桥梁模式(Bridge)

  1 package designpatterns.strucural;
  2 
  3 //抽象角色--Abstraction
  4 abstract class AbstractRemoteControl {
  5 
  6     protected ITV tv;
  7 
  8     public void bindImpl(ITV tv){
  9         this.tv = tv;
 10     }
 11 
 12     public void turnOn(){
 13         tv.on();
 14     }
 15 
 16     public void turnOff(){
 17         tv.off();
 18     }
 19 
 20     public void setChannel(int channel){
 21         tv.switchChannel(channel);
 22     }
 23 }
 24 //精确抽象角色--RefinedAbstraction
 25 class PcRemoteControl extends AbstractRemoteControl {
 26 
 27     @Override
 28     public void turnOn() {
 29         System.out.println("Pc On");
 30     }
 31 }
 32 
 33 class CommonRemoteControl extends AbstractRemoteControl{
 34 
 35     @Override
 36     public void turnOn() {
 37         super.turnOn();
 38     }
 39 
 40     @Override
 41     public void turnOff() {
 42         super.turnOff();
 43     }
 44 
 45     @Override
 46     public void setChannel(int channel) {
 47         super.setChannel(channel);
 48     }
 49 }
 50 
 51 //实现角色--mplementor
 52 /*
 53  * 首先定义电视机的接口：ITV*/
 54 interface ITV {
 55 
 56     public void on();
 57     public void off();
 58     public void switchChannel(int channel);
 59 }
 60 //具体实现角色--ConcreteImplementor1
 61 /*
 62  * 再实现三星的ITV接口。*/
 63 class SamsungTV implements ITV {
 64     @Override
 65     public void on() {
 66         System.out.println("Samsung is turned on.");
 67     }
 68 
 69     @Override
 70     public void off() {
 71         System.out.println("Samsung is turned off.");
 72     }
 73 
 74     @Override
 75     public void switchChannel(int channel) {
 76         System.out.println("Samsung: channel - " + channel);
 77     }
 78 }
 79 //具体实现角色--ConcreteImplementor2
 80 /*
 81 * 再实现索尼的ITV接口。*/
 82 class SonyTV implements ITV {
 83 
 84     @Override
 85     public void on() {
 86         System.out.println("Sony is turned on.");
 87     }
 88 
 89     @Override
 90     public void off() {
 91         System.out.println("Sony is turned off.");
 92     }
 93 
 94     @Override
 95     public void switchChannel(int channel) {
 96         System.out.println("Sony: channel - " + channel);
 97     }
 98 }
 99 
100 //测试类
101 public class Bridge {
102     public static void main(String[] args){
103         ITV tv1 = new SonyTV();
104         ITV tv2 = new SamsungTV();
105         
106         AbstractRemoteControl control = new CommonRemoteControl();
107         control.bindImpl(tv1);
108         control.turnOn();
109         control.bindImpl(tv2);
110         control.turnOn();
111 
112         AbstractRemoteControl control_pc = new PcRemoteControl();
113         control_pc.turnOn();
114     }
115 }

Sony is turned on.
Samsung is turned on.
Pc On

Animal A = new cat()
A.run()
Animal B = new dog()
B.run()

public void bindImpl(ITV tv){
        this.tv = tv;
    }