More than 25 states

pass。。

 

public class PoymorphicDemo {
    public static void main(String[] args) {
        Animal a = new Cat();
        a.eat();
    }
}

class Animal {
    public void eat() {
        System.out.println("吃东西");
    }
}

class Cat extends Animal {
    @Override
    public void eat() {
        System.out.println("啃骨头");
    }
}

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