適配器模式： 將一個類的接口，轉換成客戶所期待的接口，適配器讓原本不兼容的類可以合作無間。有兩種形式：類適配器和對象適配器。前者需要用到多重繼承（java不支持），後者要用到組合。
外觀模式： 提供了一個統一的簡化的接口，用來訪問子系統裏的一羣接口。外觀定義了一個高層接口，讓子系統更容易使用。
適配器的類圖
適配器的一個簡單源碼：
package adapter;
/**
* 鴨子接口
* @author Arvon
*
*/
public interface Duck {
public void quack();
public void fly();
}
package adapter;
/**
* 火雞接口
* @author Administrator
*
*/
public interface Turkey {
public void fly();
public void goggle();
}
package adapter;
/**
* 一個僞裝成火雞的鴨
* @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);
//將鴨子接口轉換成了火雞接口
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();
}
}
程序輸出：
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...
外觀模式類圖
核心代碼：
package facade;
/**
* 簡化了的接口
* @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();
}
}
其他的類都是子系統的類 這裏就不貼出來啦。
程序的輸出：
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
