How can you tell if JAVA_HOME contains a JDK in a Windows batch file?

Question

是否可以判断Windows批处理文件中的JAVA_HOME系统环境变量是否包含JDK？

Answer 1

You could look for %JAVA_HOME%\\bin\\javac.exe (or whatever it is, I assume exe). That should not exist in a JRE, only in the JDK.

Answer 2

If you're checking to see if the compiler exists, you could do something like:

if exist %JAVA_HOME%\bin\javac.exe (
   ...
) else (
   ...
)