public void close() throws IOException {
  ServerSocketChannel ss=_ss;
  _ss=ss;
  if (ss != null) {
    try {
      ss.close();
    }
 catch (    Exception e) {
    }
  }
}

public void close ( ) throws IOException { ServerSocketChannel ss = _ss ; _ss = ss ; if ( ss != null ) { try { ss . close ( ) ; } catch ( Exception e ) { } } }
closes the underlying socket .
