public void updateLists() {
        pizzas.clear();
        drinks.clear();
        specials.clear();
        coupons.clear();

        for (MenuItem m : MenuController.getInstance().loadMenu()) {
            if(m.getType().equals(ItemType.PIZZA))
                pizzas.addElement(m.getName());
            else if (m.getType().equals(ItemType.DRINK))
                drinks.addElement(m.getName());
            else if (m.getType().equals(ItemType.SPECIAL))
                specials.addElement(m.getName());
            else if (m.getType().equals(ItemType.REWARD))
                coupons.addElement(m.getName());
        }
    }