public class DeckOfCards
{
    private Card[] deck;
    private int    dealPosition;

    DeckOfCards()  // Constructor to make a deck of cards
    {
        deck = new Card[52];    // Make a holder for 52 cards

        String[] suit = {"Spades", "Hearts", "Diamonds", "Clubs"};
        String[] rank = {"Ace", "2", "3", "4", "5", "6", "7", "8",
                         "9", "10", "Jack", "Queen", "King"};
        int k = 0;   // Index into deck[ ]
        // Use a nested loop to make all 52 cards and assign to deck[ ]
        for ( int i = 0; i < suit.length; i++ )
            for (int j = 0; j < rank.length; j++ )
            {
                deck[k] = new Card( suit[i], rank[j] );
                k++;
            }
    }

    // Shuffle this deck of cards
    public void shuffle()  
    {
        for (int i = 0; i < deck.length; i++) 
        {  // Generate an index j randomly
            int j = (int)(Math.random() * deck.length);

            Card temp = deck[i];   // Swap card[i] and card[j]
            deck[i] = deck[j];
            deck[j] = temp;
        }
       
        dealPosition = 0; // Reset the next deal card position
    }

    // Deals (= returns) the next card in this deck
    public Card deal()  
    {
        Card nextCard;

    if ( dealPosition < deck.length )
     { 
        nextCard = deck[dealPosition];
            dealPosition++;
        }
    else
        nextCard = null;

        return nextCard;
    }
}