门面模式 - Facade Pattern

门面模式 - Facade Pattern

无门面模式时:

有门面模式时:

package  pattern.facade;
/**
 * 门面模式/外观模式:Facade Pattern
 *
 * 保安系统:
 * 一个保安系统由两个录像机、一个感应器和一个报警器组成。
 * 由保安操作仪器的启动和关闭:没有使用门面模式时，保安必须亲自启动每个仪器。
 *  @version  2009-6-15
 *  @author  Winty([email protected])
  */
public   class  FacadeTest{
     public   static   void  main(String[] args){
         // 无门面模式
        Camera camera1,camera2;
        camera1  =   new  Camera();
        camera2  =   new  Camera();
        
        Sensor sensor;
        sensor  =   new  Sensor();

        Alarm alarm;
        alarm  =   new  Alarm();

         // 启动仪器
        camera1.turnOn();
        camera2.turnOn();
        sensor.activate();
        alarm.activate();
        System.out.println( "" );

         //////////////////////////////// /
         // 使用门面模式
        SecurityFacade security  =   new  SecurityFacade();
        security.start();
    }
}

/**
 * 门面:Facade
  */
class  SecurityFacade{
     private  Camera camera1;
     private  Camera camera2;
     private  Sensor sensor;
     private  Alarm alarm;

     public  SecurityFacade(){
        camera1  =   new  Camera();
        camera2  =   new  Camera();
        sensor  =   new  Sensor();
        alarm  =   new  Alarm();
    }
     // 启动
     public   void  start(){
        camera1.turnOn();
        camera2.turnOn();
        sensor.activate();
        alarm.activate();
    }

     // 停止
     public   void  stop(){
        camera1.turnOff();
        camera2.turnOff();
        sensor.deactivate();
        alarm.deactivate();
    }
}

class  Camera{
     public   void  turnOn(){
        System.out.println( " turn on the Camera. " );
    }

     public   void  turnOff(){
        System.out.println( " turn off the Camera. " );
    }

     // 转动
     public   void  rotate(){
        System.out.println( " rotate the Camera. " );
    }
}


class  Sensor{
     public   void  activate(){
        System.out.println( " activate the sensor. " );
    }

     public   void  deactivate(){
        System.out.println( " deactivate the sensor. " );
    }

     // 触发感应器
     public   void  trigger(){
        System.out.println( " trigger the sensor. " );
    }
}

class  Alarm{
     public   void  activate(){
        System.out.println( " activate the alarm. " );
    }

     public   void  deactivate(){
        System.out.println( " deactivate the alarm. " );
    }

     // 拉响报警器
     public   void  ring(){
        System.out.println( " ring the alarm. " );
    }
} 

运行结果:

turn on the Camera.

turn on the Camera.

activate the sensor.

activate the alarm.

turn on the Camera.

turn on the Camera.

activate the sensor.

activate the alarm.