Anvil repair materials (1.13.2)

[GreenbackCafe]

I'm in the process of rewriting my code after finding a better tutorial, and I was wondering how to use an item as a repair material for tools/armor. Before, I would just call the variable directly from my ItemList (which would have things like "public static Item copper_ingot;"), and the ItemList would be used to statically initialise the items. Now that I've learned that's not a good idea, I switched to Cadiboo's method, but I no longer have a variable to reference as an Item for things like this. Is there another way to do this? 

 

I'd also appreciate any general suggestions on how to improve my code. 

https://github.com/GreenbackCafe/randommod

[GreenbackCafe]

Whoops, I posted this in the wrong place. My bad