ItemStack Help

How do I remove a certain amount of itemstack from a player?
E.G.
I defined an itemstack which gives 1
then I want to take 45 of that item when someone buys something, how (it needs to be that specific itemstack)?
Thanks!

 

Not sure. I know that there is p.getInventory().remove(new ItemStack(Material.ITEM))

 

boss86741 yea but I need to remove a certain amount
Could do a while loop, but I would prefer it if there was a normal method.. I would of thought there would be
while (int x < amt to take) {
inv.remove(item)
}
hmm..

 

p.getInventory().remove(new ItemStack(Material.ITEM,amount));

 

Pizza371 Loop through inv contents, check if inv contains certain item, set amount of item to x.

 

Pizza371
Make sure the inventory containsAtLeast(...) the item and use ShadowNinja's method

 

xTrollxDudex Compressions XxShadow_NinjaxxX
I can't use that method because i cant make an itemstack with an already existing itemstack
Not entirely sure how to get a specific item inside an inventory and change its amount
I need something like this:

Code:

    if(p.getInventory().contains(itemstack, 40)) {
                    p.getInventory().removeItem(itemstack, amount);

but another way of doing that, since I can't do it that way