In the 1.7 Forge, the setToolClass() method was removed and replaced with a "behind-the-scenes" toolClass assigner in the ItemTool class. This is great because I don't have to do it manually for Pickaxes, Axes, and Shovels. However, I can't seem to figure out how to add a custom tool class, or assign a custom tool multiple tool classes. I thought that I could just reference the toolClass field if I extended ItemTool, but I found that the field's scope was set to private. Is there a way I can achieve what I explained earlier?

All the "tool classes" are in the Item class now.

Just override

Item#getToolClasses(ItemStack) 

and return as much as you want.

 

You may also have to override

Item#getHarvestLevel(ItemStack, String)
Block#isToolEffective(String, int)

Depending on what you want the effect to be for the blocks.

 

I think I wasn't clear. I don't want to GET anything; I want to SET custom/multiple tool classes for a custom tool.