package Demo513.Multi;
public abstract class Animal {
public static void main(String[] args) {
Animal animal =new Cat();
animal.eat();
//往下转型:必须保证对象创建的就是猫,
Cat cat=(Cat) animal;
//就可以引用子类:Cat类的方法
cat.CatchMice();
Animal Dog=new Dog();
Dog.eat();
//测试一个对象是否为一个类
if(Dog instanceof Animal) {
//会报错,转型错误
Dog dog=(Dog) animal;
dog.eat();
}
}
void eat(){
}
}
class Cat extends Animal{
@Override
void eat(){
System.out.println("我吃鱼");
}
void CatchMice(){
System.out.println("猫抓老鼠");
}
}
class Dog extends Animal{
void eat(){
System.out.println("我吃骨头");
}
}
运行代码↓
![](https://img2018.cnblogs.com/blog/1653724/201905/1653724-20190514113548628-2028698134.png)