What is best way to get .EXE file out of a java based program?

Answer 1

There's a couple of ways to do it. This article will explain what you need to be aware of and it provides links to both commercial and free software to perform the conversion.

http://www.excelsior-usa.com/articles/java-to-exe.html

It lists many other options ,scroll down about half the page to find the exe section - Custom Java Launchers And Wrappers.

Answer 2

you could try a decompiler or resource hacker