code: public static URL createURL(String protocol, String host, String file)
              throws MalformedURLException {
          return createURL(protocol, host, -1, file);
  
      }
docs: Creates a URL from the specified protocol name, host name, and file name.
  The default port for the specified protocol is used.
  <p/>
  This method is equivalent to calling the four-argument method with
  the arguments being protocol, host, -1, and file. No validation of the
  inputs is performed by this method.
  
  @param protocol the name of the protocol to use
  @param host     the name of the host
  @param file     the file on the host
  @return URL created using specified protocol, host, and file
  @throws MalformedURLException if an unknown protocol is specified