How can I make some items in a JComboBox unselectable?

Question

How can I make some of my JComboBox Items unselectable? 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

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.

Answer 2

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.