This is an example of how to update values stored in a Java JComboBox called cb.
In the code below, myCards is just a data structure that stores a list of cards. 
One iterates over the list myCards. For each Card object in the list, the code adds its String
representation to cb.

Note, this method is in a Game class and not the interface class because myCards is a 
field in the Game class.  It is called from Frame class. The comboBox in the Frame class
is passed in as a parameter.


public void setComboLabels(JComboBox cb) {
        cb.removeAllItems();   // remove all items
        java.util.Iterator<Card> iter = myCards.iterator();  // grab an iterator for myCards
        while (iter.hasNext()) {   // iterate over myCards
            Card c = iter.next();  // get next card in myList
            cb.addItem(c.toString());  // add the card's String rep to the combobox
        }
}