Inventory removes 1 unit

How can I do to remove one drive? I tried:

Code:

Player p = (Player)sender;
ItemStack itemstack = new ItemStack(Material.DIAMOND, 1);
p.getInventory().remove(itemstack);

Why not remove?

 

Have you tried p.getInventory().removeItem(itemstack); ? Also use Player p = (Player) sender; Instead of Player p = p (sender);

 

I did as an example and it seems I was wrong.
I've tried removeItem

 

It seems to work fine for me.

 

To remove a diamond from someone's inventory you would do something like this:

Code:

int i = player.getInventory().first(Material.DIAMOND);
        if(player.getInventory().getItem(i).getAmount() > 1){
            ItemStack is = player.getInventory().getItem(i);
            is.setAmount(is.getAmount()-1);
            player.getInventory().setItem(i, is);
        }else{
            player.getInventory().setItem(i, null);
        }

I never tried using the "first" method because I usually make my own loop and find it myself. This just seems simpler.

 

Now seems to be working
It seems that was not updating the inventory and I put p.updateInventory(); to update
Thanks for helping