当启动Eclipse时，若出现提示需要Java运行环境或开发工具包，但在指定路径中未找到Java虚拟机，可按以下方法排查。通常问题出在两个方面：一是未正确配置JDK环境变量，二是系统找不到javaw.exe文件。首先检查是否已安装JDK，若未安装，需先下载并安装合适版本。

The vast majority of developers who use a JVM (Java Virtual Machine) language still use Java, but a sizable chunk of the population is shifting to Kotlin, a JVM-compatible language developed by ...

1、 右键点击Java项目，选择属性进行设置。 2、 打开属性窗口后，进入Java构建路径进行设置。 3、 进入libraries选项，双击Java系统库，此处显示的即为当前项目所使用的JDK版本信息。 4、 展开下拉菜单，选择所需JDK版本即可。

在经过评审之后，JEP 456（未命名变量与模式）从 Proposed to Target 进入到 Targeted（JDK 22）状态。这个 JEP 提议在经过前一轮预览之后确定这个特性：在 JDK 21 中发布的 JEP 443（未命名变量与模式 (预览)）。这个特性将“通过增加未命名模式和未命名变量来增强语言 ...

Java 23, now generally available, includes previews of module import declarations, stream gatherers, structured concurrency, scoped values, and a class-file API. And much more. Java Development Kit ...

The Java Development Kit (JDK) is a development environment for building Java applications and applets that can then run on any Java Virtual Machine (JVM). The JDK includes a variety of development ...

Java Development Kit (JDK) 26, a planned update to standard Java due March 17, 2026, has reached its second release candidate (RC) stage. The RC is open for critical bug fixes, with the feature set ...