How do I add an item to a player inventory which is in an ItemStack 1 by 1. Instead of placing all and checking if player inventory is full. So basically what I have is when a player does /items claim. It claims the items from the ItemStack if the player inventory is full it tells the player their inventory is full and stop giving the player the items. Can someone assist me in doing this. My ItemStack is in a HashMap and the key is the player name.