类图解析:
背景介绍:
组建一个家庭影院:DVD播放器、投影仪、自动屏幕、环绕立体声、爆米花机,要求完成使用家庭影院的功能,通过直接用遥控器(统筹各设备开关)进行控制,其过程为:
DVD、Popcorn、Projector、Screen、Stereo、TheaterLight代码如下:
public class DVDPlayer { // 使用单例模式 private static final DVDPlayer instance = new DVDPlayer(); private DVDPlayer() {} public static DVDPlayer getInstance() { return instance; } public void on() { System.out.println("dvd 打开了..."); } public void off() { System.out.println("dvd 关闭了..."); } public void play() { System.out.println("dvd 播放中..."); } public void pause() { System.out.println("dvd 暂停了..."); } }
public class Popcorn { private static final Popcorn instance = new Popcorn(); private Popcorn(){} public static Popcorn getInstance() { return instance; } public void on() { System.out.println("爆米花机打开了..."); } public void off() { System.out.println("爆米花机关闭了..."); } public void pop() { System.out.println("爆米花做好了..."); } }
public class Projector { private static final Projector instance = new Projector(); private Projector(){} public static Projector getInstance() { return instance; } public void on() { System.out.println("投影仪打开了..."); } public void off() { System.out.println("投影仪关闭了..."); } public void focus() { System.out.println("投影仪聚焦中..."); } }
public class Screen { private static final Screen instance = new Screen(); private Screen(){} public static Screen getInstance() { return instance; } public void up() { System.out.println("屏幕上升..."); } public void down() { System.out.println("屏幕下降..."); } }
public class Stereo { private static final Stereo instance = new Stereo(); private Stereo(){} public static Stereo getInstance() { return instance; } public void on() { System.out.println("立体音响打开..."); } public void off() { System.out.println("立体音响关闭..."); } public void up() { System.out.println("立体音响音量+..."); } public void down() { System.out.println("立体音响音量-..."); } }
public class TheaterLight { private static final TheaterLight instance = new TheaterLight(); private TheaterLight(){} public static TheaterLight getInstance() { return instance; } public void on() { System.out.println("灯光打开..."); } public void off() { System.out.println("灯光关闭..."); } public void dim() { System.out.println("灯光亮度调暗..."); } public void bright() { System.out.println("灯光亮度调亮..."); } }
HomeTheaterFacade(统筹各设备开关)
public class HomeTheaterFacade { private DVDPlayer dvdPlayer; private Popcorn popcorn; private Projector projector; private Stereo stereo; private Screen screen; private TheaterLight theaterLight; public HomeTheaterFacade() { this.dvdPlayer = DVDPlayer.getInstance(); this.popcorn = Popcorn.getInstance(); this.projector = Projector.getInstance(); this.stereo = Stereo.getInstance(); this.screen = Screen.getInstance(); this.theaterLight = TheaterLight.getInstance(); } /** * 准备开始 */ public void ready() { popcorn.on(); popcorn.pop(); screen.down(); projector.on(); projector.focus(); stereo.on(); dvdPlayer.on(); theaterLight.dim(); } /** * 播放 */ public void play() { dvdPlayer.play(); } /** * 暂停 */ public void pause() { dvdPlayer.pause(); } /** * 结束 */ public void end() { popcorn.off(); theaterLight.bright(); screen.up(); projector.off(); stereo.off(); dvdPlayer.off(); } }
Client(测试)
public class Client { public static void main(String[] args) { HomeTheaterFacade homeTheaterFacade = new HomeTheaterFacade(); System.out.println("----------准备开始-----------"); homeTheaterFacade.ready(); System.out.println("----------开始播放-----------"); homeTheaterFacade.play(); System.out.println("----------播放暂停-----------"); homeTheaterFacade.pause(); System.out.println("----------播放结束-----------"); homeTheaterFacade.end(); } }
实现结果: