MY SOLUTION -- USING REGEX PATTERN IN JAVA

Pattern num_regex = Pattern.compile("[0-9]");
    Pattern small_alpha_regex = Pattern.compile("[a-z]");
    Pattern cap_alpha_regex = Pattern.compile("[A-Z]");
    Pattern special_regex = Pattern.compile("[-!@#$%^&*()-+]");

    int min_len = 6;
    int count = 0;
    if (num_regex.matcher(password).find() && small_alpha_regex.matcher(password).find()
            && cap_alpha_regex.matcher(password).find() && special_regex.matcher(password).find() && n < min_len) {
        while (n != min_len) {
            n++;
            count++;
        }
    }

    if (!num_regex.matcher(password).find())
        count++;
    if (!small_alpha_regex.matcher(password).find())
        count++;
    if (!cap_alpha_regex.matcher(password).find())
        count++;
    if (!special_regex.matcher(password).find())
        count++;

    n += count;
    if (n >= min_len)
        return count;
    while (n != min_len) {
        n++;
        count++;
    }
    return count;