I am going through recovered files and trying to figure out if I need these. I tried using a Java decomplier which was JD-Gui. I can't make sense of any of the codes.
Now obviously since they are raw recovered files, they just have numbers for file names. I know lots of programs use Java so I can't even guess what they are for.
When you compile a Java program, it creates .class files. These get used by websites and games to run the program or applet.
If they were part of files that were recovered I would guess they were temporary .class files that were stored by the browser to run applets. The browser will save them and run them from a temporary location, and those will be with your temporary internet files.
if I were to guess, I would say this is what those files are for. You seldom find .class files loose in the file system except those that are from your Browser's temporary folder.