What is concurrent?

This repository contains a series of articles about Java multithreading written and maintained by members of the RedSpider community. The README is in Chinese and is very brief, so most of the context comes from the description rather than the README itself. Java multithreading, also called concurrency, refers to the ability to run multiple tasks at the same time within a single program. It is a technically complex topic in Java development, covering concepts like thread lifecycle, synchronization, locks, thread pools, and coordination between threads. A series of articles like this is typically aimed at Java developers who want to understand how these mechanisms work under the hood, not just how to use them. The repository is structured as a GitBook, which is a tool that turns Markdown files into a readable book format, either in a web browser or locally. The README explains how to run it locally: install Node Package Manager (npm) first, then use npm to install the gitbook-cli tool, clone the repository, and run the gitbook serve command to launch a local web server. Visiting localhost:4000 in a browser then shows the content as a formatted book. The README does not describe the specific topics covered in the article series or how many articles the collection contains. Readers interested in the depth of coverage would need to browse the repository's files directly or visit the published version if one exists.