class TestTransfer
{
   public static void main(String[] args)
   {  FreeChecking susan = new 
         FreeChecking(555234, 500.0, "034-55-6789");
      JointAccount ab = new JointAccount
         (555234, 200.0, "034-22-6666", "022-33-4567");
      Account.transfer(150, susan, ab);
      System.out.println("susan: " + susan.balance());
      System.out.println("ab: " + ab.balance());
   }
}