Sorry about that. I realized that'd be a problem after uploading it and trying to run it myself.
I'm working on a launch4j exe file for the game, but you should be able to run it if you do the following:
Open command prompt,
type "cd " then copy and paste the path to the folder,
press enter,
then write: java -jar "The Project.jar"
And run that.
Sorry the instructions are so long (and I'm not sure how to run it on other operating systems). I'm planning on making an update soon though for which there will be an exe.