摘要: 一、 class Mammal{}class Dog extends Mammal {}class Cat extends Mammal{} public class TestCast{ public static void main(String args[]) { Mammal m; Dog d 阅读全文
posted @ 2023-10-14 00:01 涨涨涨张 阅读(106) 评论(0) 推荐(0) 编辑