java中的类转换

Question

public class OverRiding {
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        //Super class reference to sub class Object
        Dog dog = new Animal();
        dog.eat();
        dog.bow();

        //Completely converted into pure Dog class Object
        Dog d = (Dog) dog;
        d.eat();
        d.bow();
    }
}

class Dog {
    public void eat() {
        System.out.println("Dog eat Biscuits");
    }

    public void bow() {
        System.out.println("Dog bow");
    }
}

class Animal extends Dog {
    public void eat() {
        System.out.println("Animal eat Food");
    }
}

Animal eat Food
Dog bow
Animal eat Food
Dog bow

Answer 1

你的概念不正确兄弟...

 class Animal extends Dog

动物怎么能延伸到狗？.这就像在说--“每一种动物都是狗”。这是错误的...所以，应该是相反的...

这个例子只会让你更加困惑…