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();
     }
 }
 class Dog extends Animal{
     public void move() {
         System.out.println();
     }
     public void bark() {
         System.out.println();
     }
 }
 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();
     }
 }