[DaBackpack]

yeah if you want to do something like this and prevent what YoshL and co. did, .jars are really easy to open

I would recommend choosing a different compiled language, but even C is easy-ish to reverse engineer if you have the right tools

honestly I would recommend embedding this in some kind of web app ---

server computer (yours) does all of the computing in secret, and the client side manages answer requests and stuff

cool idea though, would be interested in seeing more!

EDIT: You can still use Java for serverside code if you use https://en.wikipedia.org/wiki/JavaServer_Pages

EDIT EDIT: Final option would be using a code obfuscator but I think there are ways to decode plaintext strings in code so you'd need to be careful