protected void checkValid() throws URIException {
  if (!(equals(_scheme,DEFAULT_SCHEME) || _scheme == null)) {
    throw new URIException(URIException.PARSING,"wrong class use");
  }
}

protected void checkValid ( ) throws URIException { if ( ! ( equals ( _scheme , DEFAULT_SCHEME ) || _scheme == null ) ) { throw new URIException ( URIException . PARSING , "wrong class use" ) ; } }
verify the valid class use for construction .
