设计模式：桥接模式

简单点说，桥接模式就是一种具有两个层次的抽象。

2、JAVA实例代码

首先定义电视的接口

public interface ITV {public void on();public void off();public void switchChannel(int channel);}

?三星实现电视的接口

public class SamsungTV implements ITV {@Overridepublic void on() {System.out.println("Samsung is turned on.");} @Overridepublic void off() {System.out.println("Samsung is turned off.");} @Overridepublic void switchChannel(int channel) {System.out.println("Samsung: channel - " + channel);}}

?索尼实现电视接口

public class SonyTV implements ITV { @Overridepublic void on() {System.out.println("Sony is turned on.");} @Overridepublic void off() {System.out.println("Sony is turned off.");} @Overridepublic void switchChannel(int channel) {System.out.println("Sony: channel - " + channel);}}

?Remote control包含一个TV的引用

public abstract class AbstractRemoteControl {/** * @uml.property  name="tv" * @uml.associationEnd   */private ITV tv; public AbstractRemoteControl(ITV tv){this.tv = tv;} public void turnOn(){tv.on();} public void turnOff(){tv.off();} public void setChannel(int channel){tv.switchChannel(channel);}}

?定义一个具体的Remote Control的类

public class LogitechRemoteControl extends AbstractRemoteControl { public LogitechRemoteControl(ITV tv) {super(tv);} public void setChannelKeyboard(int channel){setChannel(channel);System.out.println("Logitech use keyword to set channel.");}}

?

public class Main {public static void main(String[] args){ITV tv = new SonyTV();LogitechRemoteControl lrc = new LogitechRemoteControl(tv);lrc.setChannelKeyboard(100);}}

?输出：

Sony: channel  100Logitech use keyword to set channel.

?概括的说，桥接模式允许对实现有两层抽象，就像例子中的TV和Remote Control。因此这样更加灵活。