Set JComboBox Items not Selectable

Question

How can I make some of my JComboBox Items not Selectable? I tried this:

@Override    
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            Component comp = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);

      if (not selectable conditions){
         comp.setEnabled(false);
         comp.setFocusable(false);
      } else {
         comp.setEnabled(true);
         comp.setFocusable(true);
      }

      return comp;
}

The items become gray, but are still selectable by the user.

Answer 1

The way I would be tempted to do this would be to only show the user(s) the valid items, anything invalid make invisible. I hope this helps.

Answer 2

Try changing the selected item to the last selected item when an 'unselectable' item is selected. That means you need to store the 'last selected item' in a field.