You're welcome
There are instructions about running a command-line application in the
Java™ Tutorials. Look for the "Hello World" pages. The "common problems" page is also useful. If you can get JCreator to work, you might already have a PATH set, but there are instructions in the
installation page; in the Windows instructions it's no 4. Remember you need a JDK, not a JRE. Do what it says to set permanently, and ignore what it says about "optional."