/**
 * A CardFactory creates cards for a member of the UW community.
 */
public abstract class CardFactory {

  protected static final Color CARD_COLOR = Color.PURPLE;
  
  /**
   * A factory method to produce a new card.
   * @return a new Card for the person with name 'name' and id number 
   */
  public abstract Card createCard(String name, String idNumber);

  public void charge(int amount) {
    // implementation omitted.
  }
  
  // other methods omitted.
  
}