question: public void close ( ) throws IOException { DatagramSocket s = _s ; _s = null ; OutputStream os = _os ; _os = null ; InputStream is = _is ; _is = null ; try { if ( os != null ) os . close ( ) ; if ( is != null ) is . close ( ) ; } finally { if ( s != null ) s . close ( ) ; } }
target:  Closes the underlying sockets and socket streams.