[JAVA]安装JDK环境 / 安装多个JAVA版本(ubuntu/Win)

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JDK

简介

JDK:java development kit (java开发工具)


JDK / JRE / JVM 区别


环境


官网下载


配置环境变量

当我们在cmd命令行敲命令时,cmd如何知道这个命令对应的可执行文件在哪里?这就要配置环境变量来告诉cmd去哪里找。当然环境变量还有其他用途,比如我们下面配置的CLASSPATH就关系到javac的编译。

Linux

Win

测试是否成功


多个JAVA版本的配置

由于有些软件对JAVA版本有要求,所以可以会要安装多个JAVA版本。

win环境:

linux环境

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