public class Card implements Comparable<Card> {
    public Card(Rank rank, Suit suit) {
    this.rank = rank;
    this.suit = suit;
  }

  @Override
  public String toString() {
    return rank + " of " + suit;
  }

  // Compare two cards
  public int compareTo(Card card) {
    if(suit.equals(card.suit)) {                                       // First compare suits
      if(rank.equals(card.rank)) {                                     // So check face values
        return 0;                                                      // They are equal
      }
      return rank.compareTo(card.rank) < 0 ? -1 : 1;
    } else {                                                           // Suits are different
      return suit.compareTo(card.suit) < 0 ? -1 : 1;                   // Sequence is C<D<H<S
    }
  }

  private Suit suit;
  private Rank rank;
}