Tutorial How to use Durability on Items

Hello everyone, my name is Poprit.
I've been coding for a little over three years, and this is my first post on bukkit.
I replied to a comment on an API called "GunsAPI." The OP of the comment was asking how to create gun 'clips' or 'magazines.' I told him ITEM DURABILITY. It's extremely simple and easy to use.
I'm going to not be providing a full tutorial but, a mini one with a few methods. For a better idea on how to use these methods you can view my comment here.
Methods

Code:

ItemStack is = e.getItem();
int uses = is.getDurability();
int full = 20;
if(uses == 0)
{
// yay! Time to reload.
if(e.getPlayer().getInventory.contains(Your ammo itemstack)
{
e.getPlayer.getInventory.remove(Your ammo itemstack);
is.setDurability((short) 20);
// send reloaded message
}
return;
}else if(uses > 20)
is.setDurability((short) 20);
// Shoot code
return;
}else
{
// Shoot code
return;
}

That is my first tutorial with some rough methods. Remember to view my comment to see how to use them!
Sincerely
- Poprit
EDIT:
You will have to put this in an interactevent and check if it's your item.

 

Thanks for one hundred views guys.
Remember feedback is welcome!
Sincerely,
- Poprit

 

You should really format your code if you make a tutorial. And maybe correct it too. You don't tell the reader, to substract 1 from the current durability either. This tutorial is not usable.