Method isMasterCard

src/main/java/com/jdon/util/UtilValidate.java:917–925

Checks to see if the cc number is a valid Master Card number @param cc a string representing a credit card number; Sample number: 5500 0000 0000 0004(16 digits) @return true, if the credit card number is a valid MasterCard number, false otherwise

(String cc)

     * @return true, if the credit card number is a valid MasterCard  number, false otherwise
     */
    public static boolean isMasterCard(String cc) {
        int firstdig = Integer.parseInt(cc.substring(0, 1));
        int seconddig = Integer.parseInt(cc.substring(1, 2));

        if ((cc.length() == 16) && (firstdig == 5) && ((seconddig >= 1) && (seconddig <= 5)))
            return isCreditCard(cc);
        return false;

    }

    /** Checks to see if the cc number is a valid American Express number
     *   @param    cc - a string representing a credit card number; Sample number: 340000000000009(15 digits)