前言

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一、外观模式基本介绍

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完整代码

DVD类

package tanchishell.SJMS.facade;

//DVD类
public class DVDPlayer {
    //使用单例模式, 使用饿汉式
    private static DVDPlayer instance = new DVDPlayer();

    public static DVDPlayer getInstanc() {
        return instance;
    }

    //打开DVD
    public void on() {
        System.out.println(" 打开DVD ");
    }

    //关闭DVD
    public void off() {
        System.out.println("  关闭DVD ");
    }

    //播放DVD
    public void play() {
        System.out.println(" 播放DVD ");
    }

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

爆米花类

package tanchishell.SJMS.facade;

//爆米花机
public class Popcorn {
    private static Popcorn instance = new Popcorn();
    public static Popcorn getInstance() {
        return instance;
    }
    //打开爆米花机
    public void on() {
        System.out.println(" 打开爆米花机 ");
    }
    //关闭爆米花机
    public void off() {
        System.out.println(" 关闭爆米花机 ");
    }
    //爆米花机正在工作
    public void pop() {
        System.out.println(" 爆米花机正在工作 ");
    }
}

投影仪类

package tanchishell.SJMS.facade;

//投影仪
public class Projector {
    private static Projector instance = new Projector();
    public static Projector getInstance() {
        return instance;
    }

    //打开投影仪
    public void on() {
        System.out.println(" 打开投影仪 ");
    }
    //关闭投影仪
    public void off() {
        System.out.println(" 关闭投影仪 ");

    }

    //投影仪正在工作
    public void focus() {
        System.out.println(" 投影仪正在工作 ");
    }
}

屏幕类

package tanchishell.SJMS.facade;


//屏幕类
public class Screen {

    private static Screen instance = new Screen();
    public static Screen getInstance() {
        return instance;
    }

    //升起屏幕
    public void up() {
        System.out.println(" 升起屏幕 ");
    }

    //下降屏幕
    public void down() {
        System.out.println(" 下降屏幕 ");
    }
}

立体声类

package tanchishell.SJMS.facade;


//立体声
public class Stereo {
    private static Stereo instance = new Stereo();
    public static Stereo getInstance() {
        return instance;
    }

    //打开立体声
    public void on() {
        System.out.println(" 打开立体声 ");
    }

    //关闭立体声
    public void off() {
        System.out.println(" 关闭立体声 ");
    }

}

灯光类

package tanchishell.SJMS.facade;

//灯光类
public class TheaterLight {

    private static TheaterLight instance = new TheaterLight();
    public static TheaterLight getInstance() {
        return instance;
    }
    //打开灯光
    public void on() {
        System.out.println(" 打开灯光 ");
    }

    //关闭灯光
    public void off() {
        System.out.println(" 关闭灯光 ");
    }

    //调暗灯光
    public void dim() {
        System.out.println(" 调暗灯光.. ");
    }

    //调亮灯光
    public void bright() {
        System.out.println(" 调亮灯光.. ");
    }
}

家庭影院类进行聚合

package tanchishell.SJMS.facade;


//家庭影院类进行聚合
public class HomeTheaterFacade {
    //定义各个子系统对象
    private TheaterLight theaterLight;
    private Popcorn popcorn;
    private Stereo stereo;
    private Projector projector;
    private Screen screen;
    private DVDPlayer dVDPlayer;

    //构造器获取子系统单例对象
    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();
    }

    /**操作分成 4 步  准备 开始  暂停  结束
     *
     */

    //准备
    public void ready() {
        //打开爆米花机
        popcorn.on();
        //爆米花机正在工作
        popcorn.pop();
        //下降屏幕
        screen.down();
        //打开投影仪
        projector.on();
        //打开立体声
        stereo.on();
        //打开DVD
        dVDPlayer.on();
        //调暗灯光
        theaterLight.dim();
    }


    //开始
    public void play() {
        //播放DVD
        dVDPlayer.play();
    }

    //暂停
    public void pause() {
        //暂停DVD
        dVDPlayer.pause();
    }


    //结束
    public void end() {
        //关闭爆米花机
        popcorn.off();
        //调亮灯光
        theaterLight.bright();
        //升起屏幕
        screen.up();
        //关闭投影仪
        projector.off();
        //关闭立体声
        stereo.off();
        //关闭DVD
        dVDPlayer.off();
    }
}

Client测试类

public class Client {
    public static void main(String[] args) {
// TODO Auto-generated method stub
//这里直接调用。。 很麻烦
        HomeTheaterFacade homeTheaterFacade = new HomeTheaterFacade();
        homeTheaterFacade.ready();
        System.out.println("-------------------------");

        homeTheaterFacade.play();
        System.out.println("-------------------------");

        homeTheaterFacade.pause();
        System.out.println("-------------------------");
        homeTheaterFacade.end();

    }
}


输出

 打开爆米花机 
 爆米花机正在工作 
 下降屏幕 
 打开投影仪 
 打开立体声 
 打开DVD 
 调暗灯光.. 
-------------------------
 播放DVD 
-------------------------
 暂停DVD ..
-------------------------
 关闭爆米花机 
 调亮灯光.. 
 升起屏幕 
 关闭投影仪 
 关闭立体声 
  关闭DVD