Okay, so I'm not sure what's wrong with my furnace. I've been following ScratchForFun's youtube series on how to make a custom Furnace, and whilst I understand most of the Java, I'm struggling to identify what's going on for my issue.
The GUI works, well, it opens. I can add one of each item, but it like, duplicates but disappears if put with another stack or thrown or whatever.
Here is a download for my source code, as I have no idea where my error is coming from. (It's the Kercite Furnace btw)
https://www.mediafire.com/?f75ajipd5m9cm5d
Thanks people!