上周帮一个学弟做模拟面试。他准备了三个月，把网上能找到的Java面试题背了个遍。从HashMap扩容到线程池参数，从JVM垃圾回收到MySQL隔离级别，倒背如流。 我随便问了一句：“你们线上系统用过线程池吗？corePoolSize和maxPoolSize你是怎么设置的？” 他愣了三秒 ...

Java dominates the backend development, which supports everything from enterprise systems to cloud-native applications. With the advent of microservices and cloud-based solutions as well as increased ...

大家好，我是小林。 这几天看到 OPPO 开始开奖了，就跟大家捋捋 26 届校招开发岗的薪资情况，目前知道的就这么几个例子： 应用开发：22k x 15，南京，硕士 后端开发：24k x 15 + 1.2k x 12（房补），硕士，深圳 后端开发：20k x 15 + 1.2k x 12（房补），本科，深圳 C++ ...

Have you ever wondered how Java seamlessly combines its primitive data types with object-oriented programming? Enter wrapper classes, an important but often overlooked Java feature. These special ...

Iterators in Java typically expect exclusive access to the data structure they loop through. If another thread tries to modify a collection of objects while an ...

KSafe ships an agentskills.io-compatible skill — skills/ksafe/SKILL.md — that teaches any AI agent (Claude Code, Codex, Gemini CLI, Copilot CLI, Junie) KSafe's patterns, anti-patterns, and gotchas.

我在之前两讲介绍了Java集合框架的典型容器类，它们绝大部分都不是线程安全的，仅有的线程安全实现，比如Vector、Stack，在性能方面也远不尽如人意。幸好Java语言提供了并发包（java.util.concurrent），为高度并发需求提供了更加全面的工具支持。 今天我要问你的 ...

Scala stairs at École polytechnique fédérale de Lausanne inspired the Scala logo (http://www.scala-lang.org) designed by Gilles Dubochet. Though IT originated as ...