Q&A for How to Run a .Jar Java File

You just download them. Minecraft won't affect it unless your computer is really old and slow.

You use the command: "java -jar ". You can also run these files by clicking on them on some distros of Linux, but it does not happen on most.

You created it as some sort of place where you'll archive things. Even though you created a jar file, it doesn't mean that it is an executable, so it won't run.

Yes, as long as you have either Crostini or Crouton installed. Crouton: github.com/dnschneid/crouton. Crostini: it's in the chromebook settings. Look under "Linux (beta)".