private static String[] getArrayOfCardFileNames() { 
        String[] cardImageFileNames = new String[TOTAL_NUMBER_OF_CARDS + 1];
        int suitNum = 0;
        int cardValue = 0;
        
        for (int i=0; i < cardImageFileNames.length; i++) {
            if( cardValue < 10 ) {
                cardImageFileNames[i] = new String("c" + suitNum + "_0" + cardValue + ".png");
            } else {
                cardImageFileNames[i] = new String("c" + suitNum + "_" + cardValue + ".png");
            }
            
            if( cardValue == CARDS_IN_EACH_SUIT - 1) {
                suitNum++;
            }
            
            cardValue = (cardValue + 1) % CARDS_IN_EACH_SUIT;   
        }
        
        cardImageFileNames[TOTAL_NUMBER_OF_CARDS] = new String("faceDown.png");
        
        return cardImageFileNames;  
    }