---
title: "ren xin (@renxin) | Hashnode"
description: "ren xin (@renxin) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@renxin"
---

@renxin

# ren xin

@renxin · Joined May 2025

### [Jdk21新特性](https://sleep.renxinblog.cn/jdk21?utm_source=hashnode&utm_medium=feed)

笔者在过去主要使用的JDK版本是JDK8，最近在学习最新的JDK长期支持版本——JDK21，本文将简要记录一下JDK21相比于JDK8的一些新特性，对于一些比较有意思的新特性也会在后续文章中逐步展开研究。 var关键字局部变量推断 // 仅限局部变量适用 var name = "renxin"; var age = 18; var isMan = true; var list = new ArrayList<String>(); var map = new HashMap<String,...

2 min read · [sleep.renxinblog.cn](https://sleep.renxinblog.cn/jdk21?utm_source=hashnode&utm_medium=feed)

[May 8, 2025](https://hashnode.com/posts/jdk21/681c491022f3289e215a849e)