Card Game -- OOD

import java.util.Random;

enum Suit { SPADES, CLUBS, HEARTS, DIAMONDS };

enum Face { ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING };

class Card {

    Suit suit;

    Face face;

    public Card(Suit suit, Face face){

        this.suit = suit;

        this.face = face;

    }

    public Suit getSuit(){ 

        return suit; 

    }

    public Face getFace(){ 

        return face; 

    }

}

public class DeckCardGame {

    private static final int suits_per_deck = Suit.values().length;

    private static final int cards_per_suit = Face.values().length;

   

    private Card [] cards = null;

    

    public DeckCardGame() {

        cards = new Card[suits_per_deck * cards_per_suit];

        for (Suit s : Suit.values()) {

            for (Face f : Face.values()) {

                int index = s.ordinal() * cards_per_suit + f.ordinal();

                cards[index] = new Card(s, f);

            }

        }

    }

    public void shuffle() {

        int total = suits_per_deck * cards_per_suit;

        int j = total;

        int index;

        Random rand = new Random();

        while (j > 0) {

            index = rand.nextInt(total);

            try{

            Card tmp = cards[index];

            cards[index] = cards[j];

            cards[j] = tmp;

            }catch(Exception e){

            }

            j--;

        }

    }

    public void printCards() {

        for(Card c : cards) {

            System.out.println("["+c.getSuit().toString() + " " + c.getFace().toString() + "], ");

        }

        System.out.println("");

    }

    public static void main(String [] args) {

        DeckCardGame dcg = new DeckCardGame();

        dcg.printCards();

        dcg.shuffle();

        dcg.printCards();

    }

};