文章目录

• 1 验证 jdk 是否安装成功：javac 命令
• 2 未安装成功的原因
• 3 环境变量配置
• 4 扩展
• • 4.1 javac 不是内部命令或外部命令？

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// 位置：在桌面右键单击
1. 位置：'我的电脑' → '属性' → '高级系统设置' → '高级' → '环境变量'2. 新建 3 个变量 // 建议复制，避免出错(1) CLASS_PATH    %JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar(2) JAVA_HOME   C:\Program Files\Java\jdk1.8.0_91 //需替换: 本地JDK目录(3) PATH            ;%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin说明： 若已存在变量，则先写符号 ";"，再追加值3. 请注意，若是 win10 中 "Path" 要求 "一行一行" 显示，则分行追加，如下：%JAVA_HOME%\bin%JAVA_HOME%\jre\bin

问题描述: jdk 环境变量配置完成后,提示 javac 不是内部命令或外部命令？
解决办法: 重新给定 path 路径至 bin 目录（'绝对路径'）如: ;C:\Program Files\Java\jdk1.8.0_212\bin;C:\Program Files\Java\jdk1.8.0_212\jre\bin替换掉之前的 ;%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin