Remove arrow from player's inventory

I can't find the answer to this probably simple question. I need to remove an arrow from the player's inventory every time they fire a special weapon. I have the interact events and the projectile fire, I just can't figure out how to remove exactly one arrow from the inventory, like a vanilla bow. I use ItemStack, and it only recognizes a specific size stack of arrows. I use remove by ID, and it takes all of them. Help please?

 

nuclearmissile
remove(new ItemStack(Material, Amount))

 

The thing is, if I specify the ItemStack as Arrow, 1 it doesn't recognize larger stacks as a 1 arrow stack and doesn't remove them.

 

Code:java

itemstack.setAmount(itemstack.getamount - 1);

That should work using the itemstack of arrows, if it doesn't then I've probably mis-spelt a method.

 

Ok now I know that will work wizardo, but how do I identify a stack as a stack of arrows? It still specifies a specific amount of objects when using ItemStack.

 

Bump.

 

BUMP.

 

Guys seriously this isn't answered, how do I find the itemstack of arrows if it only recognizes that exact amount in a stack?

 

Bump.

 

For loop through the inventory and check if the items material is arrow and if it is break and remove one