public void createDeck() {
        final String[] values = {"2", "3", "4", "5", "6", "7", "8", "9", "10", 
            "Jack", "Queen", "King", "Ace"};
        final String[] suits = {"Spades", "Hearts", "Diamonds", "Clubs"};
        
        // iterate values and suites to create each card; stop at deckSize
        for (String suit: suits){
            for (String value : values){
                cards.add(new Card(value, suit));
            }
        }
    }