refresh gui java

Hi,
I need to write program which show items from database. I can now display item with a given id.

What I want to do is to add "next" button to show item with id+1. I've created jButton and added following code:
itemNumber++;
validate();
but the GUI is still the same. What I did wrong?

public class SaleAssistant extends javax.swing.JPanel {

Sale sale = SaleUtil.getNextSalesAfterNow().get(0);
List<Item> SaleList = new ArrayList();
Item item;
int itemNumber = 0;
    /** Creates new form SaleAssistant */
    public SaleAssistant() {
        initComponents();
        SaleList.addAll(sale.getItems());

        item = SaleList.get(itemNumber);
       
        curCatLabel.setText(item.getCategory().toString());
        itemName.setText(item.getName().toString());
        itemID.setText(item.getIdItem().toString());
}

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static86Asked:
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Mick BarryJava DeveloperCommented:
you also need to do

        item = SaleList.get(itemNumber);
       
        curCatLabel.setText(item.getCategory().toString());
        itemName.setText(item.getName().toString());
        itemID.setText(item.getIdItem().toString());

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static86Author Commented:
thx!
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