Hey Holland, thank you so much! man, I'm so glad I joined itch, as these conversations have made me question my approach to creating games (Java not so ideal). So, I ended up asking the person that supplied the javacode on YouTube (ForeignGuyMike) and it's in Java "Swing".
He replied "I wouldn't use Swing for games anymore. Best if you just port this to some gaming framework".
Also, The more I talk to people on here, I believe this is to do with security concerns with Java in the future, and I'm not using jApplets, I am using jFrames, so that may be an issues also that I would have to iron out.
....I did learn a bit in eclipse about setting this entry point, but I'm feeling like overall I need to revamp my approach.
So, I'm going to change directions and spend my time learning C# and playing with Unity for beginners! Thanks again.