I'm working on my inventory class, on the decrStackSize method. For some reason, when I take my item out and try to place it in a stack, it doesn't affect the stack at all. None of the numbers change, the item stack from the inventory just vanishes.

 

@Override
public ItemStack decrStackSize(int i, int j)
{

	ItemStack itemStack = slots[i];

	slots[i].stackSize = 0;

	return itemStack;

}

ItemStack itemStack = slots[i];
slots[i].stackSize = 0;

 

Mmm...pointers....

 

(Tip: ItemStack is passed by reference, not by value.  When you set the stack size there, you're returning a stack of size zero:

itemStack === slot[i]

).