code: public static String extractQuery(String url)
     {
        if (url != null)
        {
           int index = url.indexOf('?');
           if (index >= 0)
           {
              url = url.substring(index + 1);
           }
        }
        return url;
     }
docs: Get the query string portion of the given URL. If no query string separator character '?' can be found, return the
  string unchanged.