仅重构一个类，JVM 堆内存直降 2994MB（≈3GB）——从 3205MB 降至 211MB，新结构内存占用仅为老方案的 6.5%。 这不是压测数据，也不是理论推演，而是生产环境双写验证的真实结果： 上线期间，新老结构并行写入，内存指标实时对比； 验证无误后，正式切换至新 ...

Getting ready for a Java interview in 2025? It can feel like a lot, especially with so many different things to know. Whether you’re just starting out or you’ve been coding for a while, this guide is ...

I noticed that the current implementation of HashMap / HashSet in the core library uses xxHash32 with a fixed seed = 0 as the default hashing strategy. xxHash32 is not collision-resistant. It was ...

OpenJDK Runtime Environment Temurin-21.0.7+6 (build 21.0.7+6-LTS) OpenJDK 64-Bit Server VM Temurin-21.0.7+6 (build 21.0.7+6-LTS, mixed mode, sharing) Error scanning ...

Community driven content discussing all aspects of software development from DevOps to design patterns. With its support for infinite-core multithreading, functional programming, JShell scripting and ...

So, you want to get good at LeetCode, especially using Java? It’s a common goal for a lot of us trying to land those tech jobs. This guide is all about helping you get there. We’ll go over how to ...