Thread: Forgot to back up

You might want to look for something call a "decompiler" or "disassembler". Because of the nature of Java compiling into byte code, it makes it somewhat easier to re-construct the source. However, good compilers will optimize/jumble up the program logic to make re-creating the original code close to impossible. Also, these types of programs generally don't generate the correct names for stuff (I think java might be different, don't know), and will never have comments (maybe Javadoc, but I doubt the .class contains even that).

There's really not a whole lot we can do. Good Java compilers are designed to specifically obfuscate the logic so it's near impossible to reconstruct the original source code because they don't want the programs to be hacked/re-engineered.