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public static boolean isValidCC(String number) { final int[][] sumTable = {{0,1,2,3,4,5,6,7,8,9},{0,2,4,6,8,1,3,5,7,9}}; int sum = 0, flip = 0; for (int i = number.length() - 1; i >= 0; i--) { sum += sumTable[flip++ & 0x1][Character.digit(number.charAt(i), 10)]; } return sum % 10 == 0; }