设计模式： 自己手动写一适配器和外观模式

标签：设计模式   适配器模式   外观模式   adapter pattern   facade pattern   

适配器模式： 将一个类的接口，转换成客户所期待的接口，适配器让原本不兼容的类可以合作无间。有两种形式：类适配器和对象适配器。前者需要用到多重继承（java不支持），后者要用到组合。

外观模式： 提供了一个统一的简化的接口，用来访问子系统里的一群接口。外观定义了一个高层接口，让子系统更容易使用。

适配器的类图

适配器的一个简单源码：

package adapter;
/**
 * 鸭子接口
 * @author Arvon
 *
 */
public interface Duck {
	public void quack();
	public void fly();
}

package adapter;
/**
 * 火鸡接口
 * @author Administrator
 *
 */
public interface Turkey {
	public void fly();
	public void goggle();
}

package adapter;
/**
 * 一个伪装成火鸡的鸭 
 * @author Administrator
 *
 */
public class TurkeyAdapter implements Duck {
	private Turkey turkey;
	
	
	public TurkeyAdapter(Turkey turkey) {
		super();
		this.turkey = turkey;
	}

	@Override
	public void quack() {
		// TODO Auto-generated method stub
		turkey.goggle();

	}

	@Override
	public void fly() {
		// TODO Auto-generated method stub
		for(int i=0;i<5;i++)
			turkey.fly();

	}

}

package adapter;

public class MalladDuck implements Duck {

	@Override
	public void quack() {
		// TODO Auto-generated method stub
		System.out.println("i am quacking...");

	}

	@Override
	public void fly() {
		// TODO Auto-generated method stub
		System.out.println("i am flying ...");

	}

}

package adapter;

public class WildTurkey implements Turkey {

	@Override
	public void fly() {
		// TODO Auto-generated method stub
		System.out.println("i am flying short distance...");

	}

	@Override
	public void goggle() {
		// TODO Auto-generated method stub
		System.out.println("i am goggling....");

	}

}

package adapter;

public class AdapterTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Duck duck = new MalladDuck();
		System.out.println(duck.getClass().getSimpleName()+" says...");
		testDuck(duck);
		//将鸭子接口转换成了火鸡接口
		Duck fakeDuck = new TurkeyAdapter(new WildTurkey());
		System.out.println(fakeDuck.getClass().getSimpleName()+" says...");
		testDuck(fakeDuck);
		
		

	}

	private static void testDuck(Duck duck) {
		duck.quack();
		duck.fly();
	}

}

MalladDuck says...
i am quacking...
i am flying ...
TurkeyAdapter says...
i am goggling....
i am flying short distance...
i am flying short distance...
i am flying short distance...
i am flying short distance...
i am flying short distance...

外观模式类图

核心代码：

package facade;
/**
 * 简化了的接口
 * @author Administrator
 *
 */
public class HomeTheaterFacade {
	Amplifier amp;
	Tuner tuner;
	DvdPlayer dvd;
	CdPlayer cd;
	Projector projector;
	TheaterLights lights;
	Screen screen;
	PopcornPopper popper;
	public HomeTheaterFacade(Amplifier amp, Tuner tuner, DvdPlayer dvd, CdPlayer cd, Projector projector,
			TheaterLights lights, Screen screen, PopcornPopper popper) {
		super();
		this.amp = amp;
		this.tuner = tuner;
		this.dvd = dvd;
		this.cd = cd;
		this.projector = projector;
		this.lights = lights;
		this.screen = screen;
		this.popper = popper;
	}
	
	public void watchMovie(String movie) {
		System.out.println("Get ready to watch a movie...");
		popper.on();
		popper.pop();
		lights.dim(10);
		screen.down();
		projector.on();
		projector.wideScreenMode();
		amp.on();
		amp.setDvd(dvd);
		amp.setSurroundSound();
		amp.setVolume(5);
		dvd.on();
		dvd.play(movie);
	}
 
 
	public void endMovie() {
		System.out.println("Shutting movie theater down...");
		popper.off();
		lights.on();
		screen.up();
		projector.off();
		amp.off();
		dvd.stop();
		dvd.eject();
		dvd.off();
	}
	

}

package facade;

public class FacadeTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Amplifier amp = new Amplifier("Top-O-Line Amplifier");
		Tuner tuner = new Tuner("Top-O-Line AM/FM Tuner", amp);
		DvdPlayer dvd = new DvdPlayer("Top-O-Line DVD Player", amp);
		CdPlayer cd = new CdPlayer("Top-O-Line CD Player", amp);
		Projector projector = new Projector("Top-O-Line Projector", dvd);
		TheaterLights lights = new TheaterLights("Theater Ceiling Lights");
		Screen screen = new Screen("Theater Screen");
		PopcornPopper popper = new PopcornPopper("Popcorn Popper");
 
		HomeTheaterFacade homeTheater = 
				new HomeTheaterFacade(amp, tuner, dvd, cd, 
						projector, lights, screen, popper);
 
		homeTheater.watchMovie("Raiders of the Lost Ark");
		homeTheater.endMovie();

	}

}

其他的类都是子系统的类 这里就不贴出来啦。

程序的输出：

Get ready to watch a movie...
Popcorn Popper on
Popcorn Popper popping popcorn!
Theater Ceiling Lights dimming to 10%
Theater Screen going down
Top-O-Line Projector on
Top-O-Line Projector in widescreen mode (16x9 aspect ratio)
Top-O-Line Amplifier on
Top-O-Line Amplifier setting DVD player to Top-O-Line DVD Player
Top-O-Line Amplifier surround sound on (5 speakers, 1 subwoofer)
Top-O-Line Amplifier setting volume to 5
Top-O-Line DVD Player on
Top-O-Line DVD Player playing "Raiders of the Lost Ark"
Shutting movie theater down...
Popcorn Popper off
Theater Ceiling Lights on
Theater Screen going up
Top-O-Line Projector off
Top-O-Line Amplifier off
Top-O-Line DVD Player stopped "Raiders of the Lost Ark"
Top-O-Line DVD Player eject
Top-O-Line DVD Player off

设计模式： 自己手动写一适配器和外观模式

标签：设计模式   适配器模式   外观模式   adapter pattern   facade pattern   

原文地址：http://blog.csdn.net/wen942467928/article/details/47999447