设计模式： 自己手动写一适配器和外观模式

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();
}

}

程序输出：

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