Removing a item

So I want it when you left click it puts the item on your head but takes the item out of your hand so basically it's like equiping armor.

The problem is it isn't removing the item from your hand it's basically duping the item.

Code:
http://pastebin.com/Y7K02kfc

 

player.getInventory().removeItem(new ItemStack(material, amount))
then something like this : player.getInventory().setHelmet(new ItemStack(Material.LEATHER_HELMET));
Cooper PluginDev

 

You also have to update the inventory (event.getPlayer().updateInventory(). It is deprecated but it works fine. Try using your code and then updating the inventory to see if it changes.

 

Still doesn't work

 

Probably because either:
A: The item has ItemMeta.
B: The item has durability.
Try doing player.getInventory().removeItem(p.getItemInHand());