JComboBox contents dont get updated(repainted) dynamically

Question

Hi,
I have 2 Combo Boxes as 2 columns of a Table and the contents of the second combo box depend on the selection in the first one.
So I added an ActionListener to the first Combo Box and depending on selection, I update the contents of the other. The contents do get updated. But I see the change only when I click on the second Combo Box. I am trying to get the user to see the change w/o him touching the other combo box. The code snippet is as below:
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals(FIRSTCOMBO)) {
combo1Index = ((JComboBox)(e.getSource())).getSelectedIndex();
DefaultComboBoxModel model = (DefaultComboBoxModel)comboBox2.getModel();
model.removeAllElements();
model.addElements(as obtained);
comboBox2.setSelectedItem(0);
comboBox2.revalidate();
comboBox2.repaint();
Doesn't seem to work. Any ideas?
Thanks a ton!

Answer 1

I don't understand the design of your table. A combo box is used in a table to give the user a choice of values to choose from. Assume the combo box contains the values "a", "b", "c", "d", "e". As a user I choose "c". The "c" now gets stored in the data model and displayed in the table cell.
Now assume you change the contents of the combo box to "1", "2", "3", "4", "5". The value in the data model has not changed , it is still "c", so there is nothing to repaint.
When the user clicks on the cell then the new values in the combo box are displayed, allowing the user to choose a new value.
If you want the table cell to repaint a new value when the second combo box is changed then you must change the data model value. Use the table.setValueAt(row, column) method.