灯泡开关小程序

方法一

灯类

//怎么产生灯亮，灯灭的动作

public class Light{

    private boolean status = true;

    public Event lightOn(){

      return new OnEvent();

}

    public Event lightOff(){

      return new OffEvent();}

    public static void main(String[] args){

       Light light = new Light();

       Event event = light.lightOff();

       Controller controller = new Controller();

       controller.addEvent(event);

//这样会存在 按几次事件 就会出现多少次 灯亮了 或 灯灭了的问题       // controller.addEvent(event);       // controller.addEvent(event);       // controller.addEvent(event);   

 

}

}

----------

//事件接口 根据不同的事件 执行不同的逻辑

//事件接口 类 Event

public interface Event{

     public void execute();}

------------

//实现接口public class OnEvent implements Event{      @Override     public void execute(){       System.out.println("灯亮了...");}

}

----------public class OffEvent implements Event{      @Override     public void execute(){       System.out.println("灯灭了...");}

}

-------------

//开关的控制 类

public class Controller{

     public void addEvent(Event event){        event.execute();}

}

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方法二解决方法一的问题手段

public class Light{

   private boolean status = true;   //灯亮

   public Event lightOn(){

     return new Event(){

     @Override

     public void execute(){       if(!status){

       status = true;

       System.out.println("灯亮了...");}

}

};

}

    public Event lightOff(){

      return new Event(){       @Override     public void execute(){      if(status){       status = false;      System.out.println("灯灭了....");}

}

};

   public static void main(String[] args) {

  Light light = new Light();  Event event = light.lightOff();  //指令    Controller controller = new Controller();    controller.addEvent(event);  //执行指令  

}

}

-------------

//开关控制 类

public class Controller {

  public void addEvent(Event event){   System.out.println("解析指令，然后执行....");  event.execute(); }}

------------------

//事件接口，根据不同的事件，执行不同的逻辑

public interface Event {  public void execute();}