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problem with updating item count based on customer amount ordered.

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so, uh sorry for once again bothering this great forum with my silly questions........but having a bit of an arithimetic problem....(seems easy in theory at least...). anyways, my problem is that i can't get the item to update properly once the customer orders the amount items: case in point:

(i can't paste a picture........I've lost the control panel on top.....anyways, i'll try my best to explain it.


private void purchase()
{
HardwareItem Item = null;
Customer customer = null;

Item = store.getStock().elementAt(this.itemSelection.getSelectedIndex() - 1);

if(Item != null)
{
for(int cust = 0; cust < custList.getLength(); cust++)
{
customer = custList.elementAt(cust);

String order = this.customerAmount.getText();

int amount = Integer.parseInt(order);

int itemAmount = Item.getNumOfPartsLeft();

int old = 0;
amount++;
old = amount;
itemAmount -= old;


if(itemAmount <= 0)
{
itemAmount = 0;

if(itemAmount == 0)
{
JOptionPane.showMessageDialog(null, "the item with name: " + Item.getItemName() + " is out of stock");
}
}
customer.setOrdered(amount);
Item.setNumOfPartsLeft(itemAmount);
this.partsL.setText(" " + Item.getNumOfPartsLeft());
}
}
}


ok, i can post links now....

http://puu.sh/1nWw0

that's one

now another:

http://puu.sh/1nWwT

hopefully this is better.

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