https://blog.youkuaiyun.com/weixin_48053213zh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/weixin_48053213/article/details/129926917https://blog.youkuaiyun.com/weixin_48053213/article/details/129926917weixin_48053213Mon, 03 Apr 2023 12:49:05 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129877588https://blog.youkuaiyun.com/weixin_48053213/article/details/129877588weixin_48053213Fri, 31 Mar 2023 19:43:52 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129817673https://blog.youkuaiyun.com/weixin_48053213/article/details/129817673weixin_48053213Tue, 28 Mar 2023 16:21:39 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129817192https://blog.youkuaiyun.com/weixin_48053213/article/details/129817192weixin_48053213Tue, 28 Mar 2023 15:25:18 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129815919https://blog.youkuaiyun.com/weixin_48053213/article/details/129815919weixin_48053213Tue, 28 Mar 2023 14:49:24 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129814681https://blog.youkuaiyun.com/weixin_48053213/article/details/129814681weixin_48053213Tue, 28 Mar 2023 14:00:36 +0800 不完整的类就叫做抽象类，因为类不完整，所以不能直接构造对象；abstract 返回值类型 方法名（参数）：抽象方法 ---> 只有申明，没有具体的实现方法.3. 抽象类无法直接构建对象，但是可以通过子类间接构建对象；2. 如果一个类是抽象类，但它里面的方法不一定是抽象方法；1. 如果一个类中含有抽象方法，那么这个类就是抽象类；类继承抽象类时，必须要将抽象方法补充完整。4. 如果抽象类含有抽象方法，那么子。]]>https://blog.youkuaiyun.com/weixin_48053213/article/details/129812586https://blog.youkuaiyun.com/weixin_48053213/article/details/129812586weixin_48053213Tue, 28 Mar 2023 11:42:14 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129811807https://blog.youkuaiyun.com/weixin_48053213/article/details/129811807weixin_48053213Tue, 28 Mar 2023 11:04:10 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129810969https://blog.youkuaiyun.com/weixin_48053213/article/details/129810969weixin_48053213Tue, 28 Mar 2023 10:32:18 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129809799https://blog.youkuaiyun.com/weixin_48053213/article/details/129809799weixin_48053213Tue, 28 Mar 2023 10:19:12 +0800 同类，同包（路径）；main方法：main方法是有JVM调用的，JVM调用时应该可以任意调用，而不用考虑权限问题。3. protected：受保护的权限，子类可以访问 ----> 同类，同包（路径），子类；1. private: 私有的，同一个类中可以使用 ----> 同类；4. public: 公共权限，任意使用 ----> 公共的；]]>https://blog.youkuaiyun.com/weixin_48053213/article/details/129800662https://blog.youkuaiyun.com/weixin_48053213/article/details/129800662weixin_48053213Mon, 27 Mar 2023 18:13:59 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129798423https://blog.youkuaiyun.com/weixin_48053213/article/details/129798423weixin_48053213Mon, 27 Mar 2023 16:45:27 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129797951https://blog.youkuaiyun.com/weixin_48053213/article/details/129797951weixin_48053213Mon, 27 Mar 2023 16:23:20 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129795937https://blog.youkuaiyun.com/weixin_48053213/article/details/129795937weixin_48053213Mon, 27 Mar 2023 15:33:01 +0800https://blog.youkuaiyun.com/weixin_48053213/article/details/129792669https://blog.youkuaiyun.com/weixin_48053213/article/details/129792669weixin_48053213Mon, 27 Mar 2023 12:11:11 +0800