public boolean addArrayOfCards(int cards[]) {
	    boolean isArrayAdded = true;
	    
	    if (cards != null && cards.length == 5) {
            // Make sure all values are nonzero
            for (int card : cards) {
                if (card < 0) {
                    isArrayAdded = false;
                    break;
                }
            }
	    } else {
	        isArrayAdded = false;
	    }
	    
        // Add the cards
        if (isArrayAdded) {
            for (int i = 0; i < cards.length; i++) {
                resCards[i] += cards[i];
            }
        }
        
        return isArrayAdded;
	}