Automatically search for files without knowing the filepath of the program?

Hello guys, I ran into a very annoying issue in Java and could not find a good solution for the error... Please help me. https://pastebin.com/md4m0SFm
The provided code is simple and there is nothing to explain about it, but I noticed, that Java does not search for the interface.txt in the local program or local project folder... Which is horrendous to me. I also noticed, that if I create a file on my Desktop called interface.txt and run the program on my DESKTOP, it suprisingly works.... What I basically wanna do is include the interface.txt to my project to display a Logo I made for my program. But no matter what I do, I always come to the conclusion that if I sent the program to a client, it would not work as their filepath or program path would be completely different if that makes sense... HELP!
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