如何用接口定义多态？

Answer 1

public interface clothes{}

public class Coat implements clothes{

}

public Person{

    public void wear(Clothes coat){

    }

}

public PersonTest{

    public static void main(String[] args){

        Person p = new Person();

        Clothes coat = new Coat();

        p.wear(coat);

    }

}

黑体就是多态了。多太有什么好处？多态可以消除复杂的条件语句或者switch语句，详情请查询关键词“工厂模式 多态 switch 消除”