Java 25 尝鲜体验

扶墙老师

发布于 2025-12-24 15:03:06

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文章被收录于专栏：扶墙集扶墙集

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 (https://github.com/fujohnwang/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