为什么无法使用javac命令

Question

使用java -version后确认jdk安装无误

以及eclipse是可以编译运行程序的

但是使用javac命令却失败

另外这是C盘下java文件里的文件,明显没有Jdk

重新梳理一下问题：
1、电脑里现在没有JDK文件夹只有JRE文件夹。
2、Eclipse可以编译运行程序。
3、由于没有jdk文件夹，无法设置环境变量，javac命令无效。

所以谁能告诉我我电脑里发生了什么？
别叫我去百度一下重新下载安装jdk 谢谢。

Answer 1

Make sure you installed jdk and not jre?

The last step you opened is obviously jre.

Find the directory of your installed jdk and set the environment variables JAVA_HOME and PATH.

Answer 2

Put the directory where javac is located in the system environment variable path, and then reopen a cmd and use it again. Eclipse can use javac because it has a function of finding the directory where the system's jdk is located.