public void update(final int v){
  chkbuf.clear();
  chkbuf.putInt(v);
  chk.update(chkbuf.array(),0,4);
}

public void update ( final int v ) { chkbuf . clear ( ) ; chkbuf . putInt ( v ) ; chk . update ( chkbuf . array ( ) , 0 , 4 ) ; }
update the running checksum to reflect the 4 byte integer .
