外观模式

package com.life.design.facade;

public class SmartAppliancesFacade {
    private Light light;
    private TV tv;
    private AirCondition airCondition;

    public SmartAppliancesFacade() {
        light = new Light();
        tv = new TV();
        airCondition = new AirCondition();
    }

    public void say(String message) {
        if (message.contains("打开")) {
            on();
        } else if (message.contains("关闭")) {
            off();
        } else {
            System.out.println("我还听不懂你说的");
        }
    }

    public void on() {
        light.on();
        tv.on();
        airCondition.on();
    }

    public void off() {
        light.off();
        tv.off();
        airCondition.off();
    }
}

package com.life.design.facade;

public class Light {
    public void on() {
        System.out.println("打开电灯");
    }

    public void off() {
        System.out.println("关闭电灯");
    }
}

package com.life.design.facade;

public class Client {
    public static void main(String[] args) {
        SmartAppliancesFacade facade = new SmartAppliancesFacade();
        facade.say("打开");
        facade.say("关闭");
    }
}