本文地址: http://blog.csdn.net/caroline_wendy
外观模式(facade pattern): 提供了一个统一的接口, 用来访问子系统中的一群接口. 外观定义了一个高层接口, 让子系统更容易使用.
外观模式包含三个部分:
1. 子系统: 子类, 单个复杂子类 或 多个子类;
2. 外观(facade)类: 把子系统设计的更加容易使用;
3. 客户: 只需要调用外观类.
与适配器模式(adapter pattern)的区别:
适配器模式的意图是, "改变"接口符合客户的期望; 外观模式的意图是, 提供子系统的一个简化接口.
面向对象的设计原则:
最少知识原则: 只和你的密友交谈.
具体方法:
1. 外观(facade)类, 包含多个子类的组合, 和一些调用多个子类的接口:
package facade;
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) {
// TODO Auto-generated constructor stub
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 threater down...");
popper.off();
lights.on();
screen.up();
projector.off();
amp.off();
dvd.stop();
dvd.eject();
dvd.off();
}
}
/**
* @time 2014年6月17日
*/
package facade;
/**
* @author C.L.Wang
*
*/
public class HomeTheaterTestDrive {
/**
* @param args
*/
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("Theatera 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("Who is a girl? ");
homeTheater.endMovie();
}
}
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 "Who is a girl? " Shutting movie threater 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 "Who is a girl? " Top-O-Line DVD Player eject Top-O-Line DVD Player off
4. 子类其余代码下载: http://download.csdn.net/detail/u012515223/7511683
设计模式 - 外观模式(facade pattern) 详解,布布扣,bubuko.com
设计模式 - 外观模式(facade pattern) 详解
原文：http://blog.csdn.net/caroline_wendy/article/details/31782225
