Please Edit Me for JComboBox

Question

Hi,
I have a JComboBox. Now i need to alter the a selected item from the list of the JComboBox. After altering the item and when i hit the enter key it should register itself with the JComboBox.
ok maybe an example will be better.
Suppose i have three fruits in the JComboBox "Mango","Apple","Grapes". Now when i have given setEditable true for the JComboBox and when i select Mango i should be able to change that to "Banana" and after hitting the enter key the items in the JComboBox should be "Banana","Apple","Grapes".
I hope i was clear enough. If not i am sorry for tht.
Any clarification you require feel free to ask.
Thank You.
Ehsan

Answer 1

The attached source code should do the trick...
    UpdatingComboBoxModel m = new UpdatingComboBoxModel(new String[] { "Mango", "Apple", "Grapes" });
    JComboBox cb = new JComboBox(m);
    cb.addActionListener(m);
    cb.setEditable(true);
    public class UpdatingComboBoxModel
        extends DefaultComboBoxModel
        implements ActionListener {
        private int lastIndex;
        public UpdatingComboBoxModel(Object[] items) {
            super(items);
        public void actionPerformed(ActionEvent e) {
            JComboBox cb = (JComboBox) e.getSource();
            if (cb.getModel() != this)
                throw new Error();
            Object o = cb.getSelectedItem();
            int i = cb.getSelectedIndex();
            if (i == -1) {
                removeElementAt(lastIndex);
                insertElementAt(o, lastIndex);
            lastIndex = i;
    }Hope that helps,
bye