class CreditCardTester {

  public static void main (String[] args) {
    CreditCard card1 = new CreditCard ("12/31/05", "Gregory Kesden", "Visa", 
           "1234 5678 9012 3456");

    System.out.println (card1);

    card1.changeExpiration ("1/1/10");
    System.out.println (card1);

    card1.makeCharge (50.00);
    System.out.println (card1);

    card1.makePayment (20.00);
    System.out.println (card1);

    double currentBalance = card1.getBalance();
    System.out.println ("The card's balance is $" + currentBalance);

    CreditCard card2 = new CreditCard ("1/1/04", "George Washington", 
          "Discover", "0987 6543 2109 8765", 5000.00);
    System.out.println (card2);

    CreditCard card3 = card1;

    if (card1 == card3) {
      System.out.println ("Cards 1 and 3 are the same card.");
    } else {
      System.out.println ("Cards 1 and 3 are NOT the same card.");
    }

    if (card1.equals(card3)) {
      System.out.println ("Cards 1 and 3 are equivalent.");
    } else {
      System.out.println ("Cards 1 and 3 are NOT equivalent.");
    }


    CreditCard card4 = new CreditCard ("1/1/04", "George Washington", 
          "Discover", "0987 6543 2109 8765", 5000.00);

    if (card2.equals(card4)) {
      System.out.println ("Cards 2 and 4 are equivalent.");
    } else {
      System.out.println ("Cards 2 and 4 are NOT equivalent.");
    }

    System.out.println (card2);
    System.out.println (card4);

    if (card2.equals(card1)) {
      System.out.println ("Cards 2 and 1 are equivalent.");
    } else {
      System.out.println ("Cards 2 and 1 are NOT equivalent.");
    }

    
    
  }

}