Kauavitorio

private static final int[] WeightCPF = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2};

    public static boolean isValidCPF(String cpf) {
        cpf = cpf.trim().replace(".", "").replace("-", "");
        if (cpf.length() != 11) return false;

        for (int j = 0; j < 10; j++)
            if (padLeft(Integer.toString(j), Character.forDigit(j, 10)).equals(cpf))
                return false;