设计模式 外观模式

概念

案例

代码实现

定义两个电器类 有共同的打开关闭接口

public class Light {
    public void on(){
        System.out.println("打开了灯---");
    }

    public void off(){
        System.out.println("关闭了灯---");
    }
}

public class TV {
    public void on(){
        System.out.println("打开了电视---");
    }

    public void off(){
        System.out.println("关闭了电视---");
    }
}

通过智能音响类来统一管理

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

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

    public void say(String message){
        if(message.contains("打开")){
            this.on();
        }
        else if(message.contains("关闭")){
            this.off();
        }
        else {
            System.out.println("请重新说一遍");
        }
    }

    private void on(){
        light.on();
        tv.on();
    }

    private void off(){
        light.off();
        tv.off();
    }
}

测试使用:

public class Test {
    public static void main(String[] args) {
        SmartAppliancesFacade smartAppliancesFacade = new SmartAppliancesFacade();
        smartAppliancesFacade.say("打开家电");
        smartAppliancesFacade.say("关闭家电");
    }
}

代码分析

使用场景