书最推荐《Java核心技术卷I》，系统、严谨，适合反复翻阅；如果觉得太厚，可以配合Head First Java这种轻松一点的入门书来做调剂。 还有一个很多人忽略的宝藏资源就是Oracle官方提供的Java Tutorials，看着是全英文，其实结构清晰，遇到具体语法问题时去查非常高效。

本内容遵循CC 4.0 BY-SA版权协议 凌晨两点，监控系统弹出一条告警：某核心业务的缓存命中率从 98% 掉到 71%，接口平均响应时间上涨了 4 倍。值班同学登录集群查看，发现集群状态是 ok，但客户端日志里密密麻麻地刷着 MOVED 和 ASK 重定向信息，还有少量 CLUSTERDOWN 报错 ...

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

The main problem was 'class file has wrong version 55.0, should be 52.0'. This is caused when the Jar that I have included in the project was compiled with Java 11. The person who compiled that Jar ...