CPE 102 Extra Credit Projects
    
    The projects below are available for extra credit.  Each
    project can earn credit equivalent to a regular project.  The
    prerequisite for each project is shown.   You must have
    completed the projects for the indicated chapter in order to be
    eligible for that extra credit.
    
    It is expected you will follow the Object Oriented Design process
    described in the book.  
    
    Follow the regular submission procedure.  Submit your solution
    using handin to the folder named "ExtraCredit". 
    There is a limit of one extra credit submission per week.  The
    deadline for any submissions is 5pm on the last day of classes.
    
    
    Project EC1
    
    Parcel
      Postage problem.  (Prereq: Ch 14)
    
    
    Project EC2
    
    Lunar
      calendar     (Prereq: Ch 11)
    
    
      Project EC3
    
    Implement a Swing Graphical User Interface for the Traffic Jam supplemental
      problem.  The GUI should look something like this screenshot. 
    You may use different images.   Tip:  Use a JButton
    for each spot and have the action listener for each button call the
    method to make a move in the game logic.  (Prereq: Ch 15. Ch 18 will be helpful.)