基于luhn算法实现的银行卡号校验

CardValidation.java

package com.extracme.evcard.eye.common;

/**
 * @version 2019-01-22 09:31
 */
public class CardValidation {

    private static boolean checkBankCardNo(String cardNo) {
        char[] cartNoArray = cardNo.toCharArray();
        int cardNoLength = cartNoArray.length;
        int total = 0;
        for (int i = 1; i < cardNoLength; i++) {
            int j = cardNoLength - 1 - i;
            int num = cartNoArray[j] - 48;
            if ((i + 1) % 2 == 0) {
                num += num;

                if (num > 10) {
                    num = (num - 10) + 1;
                }
            }

            total += num;
        }

        System.out.printf("%s %s", total, total % 10);
        return (total + cardNo.charAt(cardNoLength - 1) - 48) % 10 == 0;
    }

}