num13---外观模式/过程模式

假设家庭影院有一系列设备，每个设备都有各种开闭等功能性方法，使用家庭影院功能的时候，需要进行各个设备的一系列操作，繁琐麻烦。

现在提供一个外观类，在里面定义操作流程，客户端只需要和外观类进行接口交互即可，不用管 具体的操作流程。

代码如下：

定义多个影院设备类：

public class DVDPlayer {

	private static DVDPlayer instance = new DVDPlayer();

	public static DVDPlayer getInstanc() {
		return instance;
	}

	public void on() {
		System.out.println(" dvd on ");
	}
	public void off() {
		System.out.println(" dvd off ");
	}

	public void play() {
		System.out.println(" dvd is playing ");
	}

	//....
	public void pause() {
		System.out.println(" dvd pause ..");
	}
}

　　

public class Popcorn {

	private static Popcorn instance = new Popcorn();

	public static Popcorn getInstance() {
		return instance;
	}

	public void on() {
		System.out.println(" popcorn on ");
	}

	public void off() {
		System.out.println(" popcorn ff ");
	}

	public void pop() {
		System.out.println(" popcorn is poping  ");
	}
}

　　

public class Projector {

	private static Projector instance = new Projector();

	public static Projector getInstance() {
		return instance;
	}

	public void on() {
		System.out.println(" Projector on ");
	}

	public void off() {
		System.out.println(" Projector ff ");
	}

	public void focus() {
		System.out.println(" Projector is Projector  ");
	}

	//...
}

　　

public class Screen {

	private static Screen instance = new Screen();

	public static Screen getInstance() {
		return instance;
	}

	public void up() {
		System.out.println(" Screen up ");
	}

	public void down() {
		System.out.println(" Screen down ");
	}

}

　　

public class Stereo {

	private static Stereo instance = new Stereo();

	public static Stereo getInstance() {
		return instance;
	}

	public void on() {
		System.out.println(" Stereo on ");
	}

	public void off() {
		System.out.println(" Screen off ");
	}

	public void up() {
		System.out.println(" Screen up.. ");
	}

	//...
}

　　

public class TheaterLight {

	private static TheaterLight instance = new TheaterLight();

	public static TheaterLight getInstance() {
		return instance;
	}

	public void on() {
		System.out.println(" TheaterLight on ");
	}

	public void off() {
		System.out.println(" TheaterLight off ");
	}

	public void dim() {
		System.out.println(" TheaterLight dim.. ");
	}

	public void bright() {
		System.out.println(" TheaterLight bright.. ");
	}
}

　　

创建外观类：

public class HomeTheaterFacade {

	//定义影院系统 各个子系统模块对象
	private TheaterLight theaterLight;
	private Popcorn popcorn;
	private Stereo stereo;
	private Projector projector;
	private Screen screen;
	private DVDPlayer dVDPlayer;
	//构造器
	public HomeTheaterFacade() {
		super();
		this.theaterLight = TheaterLight.getInstance();
		this.popcorn = Popcorn.getInstance();
		this.stereo = Stereo.getInstance();
		this.projector = Projector.getInstance();
		this.screen = Screen.getInstance();
		this.dVDPlayer = DVDPlayer.getInstanc();
	}
	//操作分为四部

	public void ready() {
		popcorn.on();
		popcorn.pop();
		screen.down();
		projector.on();
		stereo.on();
		dVDPlayer.on();
		theaterLight.dim();
	}
	public void play() {
		dVDPlayer.play();
	}
	public void pause() {
		dVDPlayer.pause();
	}
	public void end() {
		popcorn.off();
		theaterLight.bright();
		screen.up();
		projector.off();
		stereo.off();
		dVDPlayer.off();
	}
}

　　测试：

	public static void main(String[] args) {
		HomeTheaterFacade homeTheaterFacade = new HomeTheaterFacade();
		homeTheaterFacade.ready();
		homeTheaterFacade.play();

		homeTheaterFacade.end();
	}

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