<div style="display:flex; max-width:100%; padding-bottom:16px"> <div style="flex-shrink:0; padding-top:6px; padding-right:16px;"> <img style="width:50px; height:50px; border-radius:50%;" src="http://third.qlogo.cn/ek_app/AQVJKMtqeFCGNEZqicOj7qb7mnpcJiaZNlEOf0iasx2DicuEycbIG9cQktWUBxWR1dFWfLMI2Ilt/100"> </div> <div style="flex-grow:1; overflow:auto;"> <span style="line-height:32px"> 廖雪峰 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 98 98" style="width:24px;height:24px"><path fill-rule="evenodd" clip-rule="evenodd" d="M48.854 0C21.839 0 0 22 0 49.217c0 21.756 13.993 40.172 33.405 46.69 2.427.49 3.316-1.059 3.316-2.362 0-1.141-.08-5.052-.08-9.127-13.59 2.934-16.42-5.867-16.42-5.867-2.184-5.704-5.42-7.17-5.42-7.17-4.448-3.015.324-3.015.324-3.015 4.934.326 7.523 5.052 7.523 5.052 4.367 7.496 11.404 5.378 14.235 4.074.404-3.178 1.699-5.378 3.074-6.6-10.839-1.141-22.243-5.378-22.243-24.283 0-5.378 1.94-9.778 5.014-13.2-.485-1.222-2.184-6.275.486-13.038 0 0 4.125-1.304 13.426 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d="M90.461 40.316a26.753 26.753 0 0 1-7.702 2.109 13.445 13.445 0 0 0 5.897-7.417 26.843 26.843 0 0 1-8.515 3.253 13.396 13.396 0 0 0-9.79-4.233c-7.404 0-13.409 6.005-13.409 13.409 0 1.051.119 2.074.349 3.056-11.144-.559-21.025-5.897-27.639-14.012a13.351 13.351 0 0 0-1.816 6.742c0 4.651 2.369 8.757 5.965 11.161a13.314 13.314 0 0 1-6.073-1.679l-.001.17c0 6.497 4.624 11.916 10.757 13.147a13.362 13.362 0 0 1-3.532.471c-.866 0-1.705-.083-2.523-.239 1.706 5.326 6.657 9.203 12.526 9.312a26.904 26.904 0 0 1-16.655 5.74c-1.08 0-2.15-.063-3.197-.188a37.929 37.929 0 0 0 20.553 6.025c24.664 0 38.152-20.432 38.152-38.153 0-.581-.013-1.16-.039-1.734a27.192 27.192 0 0 0 6.692-6.94z"></path></svg> </span> <br> <span>资深软件开发工程师，业余马拉松选手。</span> </div>
因为Java程序必须运行在JVM之上，所以，我们第一件事情就是安装JDK。
搜索JDK 23，确保从Oracle的官网下载最新的稳定版JDK：
选择合适的操作系统与安装包，找到Java SE 23的下载链接，下载安装即可。Windows优先选，Linux和macOS要根据自己电脑的CPU是ARM还是x86来选择合适的安装包。
安装完JDK后，需要设置一个的环境变量，它指向JDK的安装目录。在Windows下，它是安装目录，类似：
在Mac下，它在或里，它是：
然后，把的目录附加到系统环境变量上。在Windows下，它长这样：
在Mac下，它在或里，长这样：
把的目录添加到中是为了在任意文件夹下都可以运行。打开命令提示符窗口，输入命令，如果一切正常，你会看到如下输出：
如果你看到的版本号不是，而是、之类，说明系统存在多个JDK，且默认JDK不是JDK 23，需要把JDK 23提到前面。
如果你得到一个错误输出：
这是因为系统无法找到Java虚拟机的程序，需要检查和的配置。
可以参考如何设置或更改PATH系统变量。
细心的童鞋还可以在的目录下找到很多可执行文件：
- java：这个可执行程序其实就是JVM，运行Java程序，就是启动JVM，然后让JVM执行指定的编译后的代码；
- javac：这是Java的编译器，它用于把Java源码文件（以后缀结尾）编译为Java字节码文件（以后缀结尾）；
- jar：用于把一组文件打包成一个文件，便于发布；
- javadoc：用于从Java源码中自动提取注释并生成文档；
- jdb：Java调试器，用于开发阶段的运行调试。
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