外观模式（Facade Pattern）

public class Light {

    private String position;

    public Light(String position) {
        this.position = position;
    }

    public void on(){
        System.out.println(this.position+"开灯");
    }
    public void off(){
        System.out.println(this.position+"关灯");
    }
}

public class Television {

    public void on(){
        System.out.println("开电视");
    }
    public void off(){
        System.out.println("关电视");
    }

}

public class AirConditioner {

    public void on(){
        System.out.println("开空调");
    }
    public void off(){
        System.out.println("关空调");
    }

}

public class Fan {

    public void on(){
        System.out.println("开风扇");
    }
    public void off(){
        System.out.println("关风扇");
    }

}

public class SwitchFacade {

    private Light lights[] = new Light[4];
    private Fan fan;
    private AirConditioner airConditioner;
    private Television television;

    public SwitchFacade() {

        lights[0] = new Light("左前");
        lights[1] = new Light("左后");
        lights[2] = new Light("右前");
        lights[3] = new Light("右后");

        fan = new Fan();
        airConditioner = new AirConditioner();
        television = new Television();
    }

    public void on(){
        lights[0].on();
        lights[1].on();
        lights[2].on();
        lights[3].on();
        fan.on();
        airConditioner.on();
        television.on();
    }

    public void off(){
        lights[0].off();
        lights[1].off();
        lights[2].off();
        lights[3].off();
        fan.off();
        airConditioner.off();
        television.off();
    }
}

public class Client {

    public static void main(String[] args) {
        SwitchFacade switchFacade = new SwitchFacade();
        switchFacade.on();
        System.out.println("-------------------------------");
        switchFacade.off();
    }

}