2017版外国人身份证七三一校验法计算校验值

原创已于 2024-07-05 09:23:54 修改 · 423 阅读

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#java #算法 #经验分享

于 2024-07-03 16:49:47 首次发布

public void calculateCheckDigit() {
    String strCardNum = "PAK32018108031";
    int[] ncardNUm = new int[14];
    for (int i = 0; i < 3; i++) {
        ncardNUm[i] = strCardNum.substring(i, i + 1).getBytes()[0] - 55;
        System.out.println("ncardNUm = " + ncardNUm[i]);
    }
    for (int i = 3; i < strCardNum.length(); i++) {
        ncardNUm[i] = Integer.parseInt(strCardNum.substring(i, i + 1));
        System.out.println("nNum = " + ncardNUm[i]);
    }
    int sum = 0;

    int[] weightNumber = new int[]{0x07, 0x03, 0x01};
    for (int i = 0; i < strCardNum.length(); i++){
        sum += ncardNUm[i] * weightNumber[i % 3];
    }

    System.out.println("sum = " + sum);
    int checkValue = sum % 10;
    System.out.println("checkValue = " + checkValue);
}