public class Computer {
    public void on(){
        System.out.println("打開電腦");
    }
    public void off(){
        System.out.println("關閉電腦");
    }
}

public class Light {
    public void on(){
        System.out.println("打開燈");
    }
    public void off(){
        System.out.println("關閉燈");
    }
}

public class AirConditioning {
    public void on(){
        System.out.println("打開空調");
    }
    public void off(){
        System.out.println("關閉空調");
    }
}

public class Client {
    public static void main(String[] args) {
        AirConditioning airConditioning = new AirConditioning();
        Computer computer = new Computer();
        Light light = new Light();
        //所有子系統(tǒng)打開
        light.on();
        airConditioning.on();
        computer.on();
        //所有子系統(tǒng)關閉
        computer.off();
        airConditioning.off();
        light.off();
    }
}

public class RoomFacade {
    AirConditioning airConditioning;
    Light light;
    Computer computer;

    public RoomFacade(){
        airConditioning = new AirConditioning();
        light = new Light();
        computer = new Computer();
    }

    public void on(){
        light.on();
        airConditioning.on();
        computer.on();
    }
    
    public void off(){
        computer.off();
        airConditioning.off();
        light.off();
    }
}

public class Client {
    public static void main(String[] args) {
        RoomFacade facade = new RoomFacade();
        facade.on();
        facade.off();
    }
}