摘要: class Food{} //Lev 2 class Fruit extends Food{} //Lev 3 class Apple extends Fruit{} class Banana extends Fruit{} //Lev 4 class RedApple extends Apple{ 阅读全文
posted @ 2020-07-17 16:23 chenxibobo 阅读(684) 评论(0) 推荐(0) 编辑