HK id card check digit

gistfile1.java

public boolean hkid_check_digit(String id){
    if (id.matches("[A-Z]\\d{6}-[\\d|A]") == false) {
        msgMgr.reportException("身份証號格式錯誤，X123456-X", true);
        return false;
    }

    /*
     * check digit, A=10, B=11, ... Z=35
     * the 9th weight == 36, google: another one is 58.
     *
     * check digit formula: ISBN-10
     * http://zh.wikipedia.org/wiki/%E5%9B%BD%E9%99%85%E6%A0%87%E5%87%86%E4%B9%A6%E5%8F%B7#10.E4.BD.8D
     */

    char ch = id.charAt(0);
    int first = (int)ch;
    int S = (36 * 9) + ((first - 55) * 8);
    int idx = 7;
    for (int i = 1; i <= 6; i++) {
        ch = id.charAt(i);
        int j = (int)ch;
        j = j - 48;
        S += j * idx;
        idx--;
    }

    int M = S % 11;
    int N = 11 - M;

    if (N == 10) N = 17; // ch = 'A', 65 - 48 == 17
    if (N == 11) N = 0;  // ch = '0'

    ch = id.charAt(8);
    int check_digit = (int)ch;
    check_digit = check_digit - 48;

    if (N != check_digit) {
        msgMgr.reportException("無效的香港身份証號碼", true);
        return false;
    }

    return true;
}

这是java语言？

不支援雙字母開頭的身分證號碼.