Java 十六进制求和 工具类

public static String makeChecksum(String num, int count) {
    //拆分每个16进制字符串
    String[] split = num.trim().split("");
    for (int i = split.length - 1; i > -1; i--) {
        int size = hexToInteger(split[i]) + count;
        int valuen = size % 16;
        split[i] = encodeHEx(valuen);
        count = size / 16;
    }
    StringBuilder str = new StringBuilder();
    for (int i = 0; i < split.length; i++) {
        str.append(split[i]);
    }
    return str.toString();
}

public static String makeChecksum2(String num, int count) {
    //拆分每个16进制字符串
    String[] split = num.trim().split("");
  
    int i = split.length - 1;
    StringBuilder builder = new StringBuilder();
    while(count != 0){
        if (i >= 0){
            int size = hexToInteger(split[i]) + count;
            int valuen = size % 16;
            split[i] = encodeHEx(valuen);
            count = size / 16;
        }else {
            int valuen = count % 16;
            if (valuen > 0){
                builder.append(encodeHEx(valuen));
            }
            count = count / 16;
        }
        i--;
    }
    StringBuilder str = new StringBuilder();
    if(builder.length() > 0){
        String[] bsplit = builder.toString().split("");
        for (int s = bsplit.length - 1; s > -1; s--) {
            str.append(bsplit[s]);
        }
    }
    for (int n = 0; n < split.length; n++) {
        str.append(split[n]);
    }
    return str.toString();
}

//10进制转成16进制数
public static String encodeHEx(Integer numb) {
    String hex = Integer.toHexString(numb);
    return hex;
}

//16进制数转成10进制
public static Integer hexToInteger(String hex) {
    Integer num = Integer.parseInt(hex, 16);
    return num;
}