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CreditCard.java

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package net.threebit.utils.sosc ; 

public abstract class CreditCard extends Validatable { 

        protected CreditCard(final String num, final String typ) {
                super(num, typ);
        }

        protected boolean checkDigits(final int[] digits) {
                int sumEven;
                int sumOdd;
                int sum;

                sumEven = 0;
                sumOdd = 0;
                sum = 0;         

                for (int i = (number.length() - 2); i >= 0; i--) {
                        if ((((number.length() - 2) - i) % 2) == 0) {
                                sumEven += Utils.add(digits[i] * 2);
                        }
                        else {
                                sumOdd += digits[i];
                        }
                }

                sum = sumEven + sumOdd;

                while ((sum % 10) != 0) {
                        sum++;
                }

                if ((sum - (sumEven + sumOdd)) == digits[number.length() - 1]) {
                        return(true);
                }
                return (false);
        }
}

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