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Yes, the IDE is like your mother protecting you from the real world. Time to learn how things really work.

You need to be in the directory with the KKK.jar file when you issue the java command?

There is something wrong with your installation of java if the java command is not found.
Or you need to add...

You need the error message from the java command to be able to determine what is wrong.
See post #5

Where did you enter the java command as I described in post #5? I don't see it in your post.

java -jar asdf.jar

Are you on a Windows OS?
Open a command prompt window, change to the directory with the jar file and enter this:

java -jar <YOURJARFILENAMEHERE>.jar

Copy and paste the full contents of the...