Building a Fast, Memory-Efficient Hash Table in Java: A SwissTable-Inspired Design
6 days ago 高效码农Building a Fast, Memory-Efficient Hash Table in Java: A Deep Dive into SwissTable-Inspired Design Have you ever wondered why some hash tables remain lightning-fast even under high load, while others slow to a crawl as they fill up? One day, I stumbled upon SwissTable—a design that made me squint, grin, and immediately regret every naive linear-probing hash table I’d ever written. This post is the story of how I tried to bring that “why is this so fast?” feeling into the Java world. It’s part technical deep dive, part engineering diary, and part cautionary tale about performance optimization work. I’ll …
JIT-Compile Native Code in Java: A No-JNI LLVM Tutorial for 2025
14 days ago 高效码农Java Hello World, LLVM Edition: JIT-Compiling Native Code Directly from Java (No JNI Required) Core question this article answers: How can you generate LLVM IR, JIT-compile it to real machine code, and execute it entirely from a pure Java program — using only the Foreign Function & Memory API introduced in Java 22+? The answer is surprisingly clean: combine Java’s modern FFM API with jextract-generated bindings to the LLVM C API, build a module in memory, hand it to the LLVM JIT, grab the function pointer, turn it into a MethodHandle, and call it. The entire “Hello, World!” program below …
Solve Gradle & Flutter Build Errors: Java Version Fixes & Dependency Solutions
3 months ago 高效码农Diagnosing and Fixing Gradle & Flutter Build Errors — A Practical, Step-by-Step Guide This article is a direct, practical translation and rewrite of the build logs and interactions you provided. It keeps only the facts and steps that appear in the input, presented as a clear, actionable guide for engineers with a junior-college level of experience or above. Everything below is strictly derived from the original content you supplied; no outside material has been added. Overview You provided a set of Gradle/Flutter build errors and traces. They repeatedly point to a small set of root causes that interact with each …