get free Inventory slots (without armor)

I have found the following code, that checks for the amount of free slots.
But it does so by taking 5 slots into account for the armor.

What I would need is a way to check the pure inventory (all slots (4x9 = 45 slots), but without armor) to check if I can drop the player a new item.

Code:

public int getFreeSlots(Player player) {
    int freeslots = 0;
    for (ItemStack it : player.getInventory().getContents()) {
        if (it == null || it.getType() == Material.AIR) {
            freeslots++;
        }
    }
    freeslots = freeslots - 5; // subtract shield and armor

    return freeslots;
}

 

@Macklan You can use a standard for loop to iterate the slots in the inventory.
Here's some pseudo-code to serve as an example.

Code:Java

int emptySlots = 0
for (int slot = 0; slot < inventory.size):
    if inventory.getItem(slot) == null:
        emptySlots += 1
return emptySlots