**参考阅读** https://www.javatpoint.com/abstract-class-in-java https://www.differencebetween.com/difference-between-abstract-class-and-vs-interface/ https://www.javaworld.com/article/2077421/learn-java/abstract-classes-vs-interfaces.html 分类: java基础 好文要顶 关注我 收藏该文 微信分享 ...