Method isIPv6

solution/0400-0499/0468.Validate IP Address/Solution.java:32–52

(String s)

    }

    private boolean isIPv6(String s) {
        if (s.endsWith(":")) {
            return false;
        }
        String[] ss = s.split(":");
        if (ss.length != 8) {
            return false;
        }
        for (String t : ss) {
            if (t.length() < 1 || t.length() > 4) {
                return false;
            }
            for (char c : t.toCharArray()) {
                if (!Character.isDigit(c)
                    && !"0123456789abcdefABCDEF".contains(String.valueOf(c))) {
                    return false;
                }
            }
        }
        return true;
    }

    private int convert(String s) {
        int x = 0;