public class TestChecking
{
   public static void main( String[] args )
   {
      CheckingAccount acc1 = new CheckingAccount(123, "John", 1000.0);
      CheckingAccount acc2 = new CheckingAccount();

      System.out.println( "acc1: " + acc1 ); // Uses toString() inherited
      System.out.println( "acc2: " + acc2 ); // from BankAccount
   }
}