Finding out how many of a certain item a player has

How to find out how many of a certain item a player has? E.g. Find out how many emeralds is in a players inventory.

 

Try

Code:

event.getPlayer().getItemInHand().getAmount()

or this

Code:

event.getPlayer().getInventory().getItem(int)

 

DarknessXIII
I'm not sure if that is quite what he is looking for because doesn't that only get the amount in that specific slot? I think he wants the total in the entire inventory? I quickly whipped up this method that I think will do the trick.

Code:

public int getAmountInInventory(Player player, int itemId)
{
    int total = 0;
    for(ItemStack is : player.getInventory())
    {
        if(is.getTypeId == itemId)
        {
            total += is.getAmount();
        }
    }
    return total;
}

However I cannot promise you that this will work right out of the box. I haven't tested it and because I accidentally put something else on my clipboard, I just typed all that out in the forum code paster thingy manually XD

I'm pretty sure that foreach loop works, but again, I haven't really tested it so if it doesn't give this a try:

Code:

for(ItemStack is : player.getInventory().getContents())

This is the way I know of that would work. I went through the inventory api, and there doesn't seem to be any methods that return the amount of the item in the ENTIRE inventory. But perhaps I read something wrong. I woke up 10 minutes go lol