Java【基础学习】向下转型和上转型例子

Java小白应付期末考试QWQ

class Animal{
    public void move() {
        System.out.println(1);
    }
}
class Dog extends Animal{
    public void move() {
        System.out.println(2);
    }
    public void bark() {
        System.out.println(3);
    }
}
public class Main{
    public static void main(String[] args) {
        Animal a1=new Animal();
        a1.move();
        Animal a2=new Dog();
        a2.move();
        Dog a3=(Dog)a2;
        a3.bark();
    }
}