Java 25 尝鲜体验

王福强

2025-09-17


Java 25 出来啦~

把 JavaFX相关的几个项目先直接升级到了Java 25,没任何错误需要修复,相当丝滑,最主要的是,换完jdk,重新打包后,keeboxfx的安装包从919+M降到了715.6M🤣 ,就一个字,帅,三个字,干得漂亮

顺便把 KVectors 也一并升了:

LuckyJohn💫 ➜  kVectors git:(master)  git ci -m "bump up java to 25"
[master 982663f] bump up java to 25
 2 files changed, 27 insertions(+), 2 deletions(-)

有小兄弟说我追新,哈哈哈,只要这个新带来的是好的,就应该追。

什么都不做,只要升级单一依赖就能带来性能和效率上的绝大提升,干嘛不追?🤣

Java 25 这次发布主要包含了如下几个大的JEP特性:

  • JEP 470 PEM Encodings of Cryptographic Objects // 这个好
  • JEP 502 Stable Values // 线程安全的lazy init, 有点儿loading cache那种API设计风格。
  • JEP 503 Remove the 32-bit x86 Port
  • JEP 505 Structured Concurrency // // 这个可以
  • JEP 506 Scoped Values // virtual threads的完美搭档
  • JEP 507 Primitive Types in Patterns, instanceof, and switch // java语法特性
  • JEP 508 Vector API (Tenth Incubator)// 这阵子个人关注最多的JEP
  • JEP 509 JFR CPU-Time Profiling // JFR打头儿的都是技术保障部的事儿,性能与稳定性🤣
  • JEP 510 Key Derivation Function API // 这个也好, 量子计算来了也不怕。
  • JEP 511 Module Import Declarations // jpms带来的那啥
  • JEP 512 Compact Source Files and Instance Main Methods // java 写脚本
  • JEP 513 Flexible Constructor Bodies // 继承上的改进,super()和this()不用非得在方法第一行了。
  • JEP 514 Ahead-of-Time Command-Line Ergonomics // AOT 打头儿的估计都从graalvm剥离出来的?Project Leyden vs. graalvm
  • JEP 515 Ahead-of-Time Method Profiling
  • JEP 518 JFR Cooperative Sampling
  • JEP 519 Compact Object Headers // 省内存,$ java -XX:+UseCompactObjectHeaders …
  • JEP 520 JFR Method Timing & Tracing
  • JEP 521 Generational Shenandoah // 垃圾回收(gc)上的改进

当然,还有成千的微小改进和bug修复,这一般都一笔带过,但积攒多了带来的也是质变。

每个特性详细介绍,这篇文章我觉得写的挺好(下面表格也是整理自这篇文章),感兴趣的同学可以看看:https://hanno.codes/2025/09/16/heres-java-25/

JEP Title Status Project Feature Type Changes since Java 24
(#jep-470-pem-encodings-of-cryptographic-objects-preview) PEM Encodings of Cryptographic Objects Preview Security Libs Security New feature
(#jep-502-stable-values-preview) Stable Values Preview Core Libs New API New feature
(#jep-503-remove-the-32-bit-x86-port) Remove the 32-bit x86 Port HotSpot Deprecation Removal
(#jep-505-structured-concurrency-fifth-preview) Structured Concurrency Fifth Preview Loom Concurrency Major
(#jep-506-scoped-values) Scoped Values Loom Concurrency Minor
(#jep-507-primitive-types-in-patterns-instanceof-and-switch-third-preview) Primitive Types in Patterns, instanceof, and switch Third Preview Amber Language None
(#jep-508-vector-api-tenth-incubator) Vector API Tenth Incubator Panama New API Minor
(#jep-509-jfr-cpu-time-profiling-experimental) JFR CPU-Time Profiling Experimental HotSpot / JFR Profiling New feature
(#jep-510-key-derivation-function-api) Key Derivation Function API Security Libs Security None
(#jep-511-module-import-declarations) Module Import Declarations Amber Language None
(#jep-512-compact-source-files-and-instance-main-methods) Compact Source Files and Instance Main Methods Amber Language Major
(#jep-513-flexible-constructor-bodies) Flexible Constructor Bodies Amber Language None
(#jep-514-ahead-of-time-command-line-ergonomics) Ahead-of-Time Command-Line Ergonomics Leyden Performance New feature
(#jep-515-ahead-of-time-method-profiling) Ahead-of-Time Method Profiling Leyden Performance New feature
(#jep-518-jfr-cooperative-sampling) JFR Cooperative Sampling HotSpot / JFR Profiling New feature
(#jep-519-compact-object-headers) Compact Object Headers HotSpot Performance None
(#jep-520-jfr-method-timing–tracing) JFR Method Timing & Tracing HotSpot / JFR Profiling New feature
(#jep-521-generational-shenandoah) Generational Shenandoah HotSpot / GC Performance Stability and performance improvements

NOTE

JEP life stages: incubation -> preview -> finalized.


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