tokens = new Vector();
tokens = new ArrayList();
  private void readObject(ObjectInputStream stream)    throws IOException, ClassNotFoundException  {    stream.defaultReadObject();    if (serialVersionOnStream < 1)      {        computeCenturyStart ();	serialVersionOnStream = 1;      }    else      // Ensure that defaultCentury gets set.      set2DigitYearStart(defaultCenturyStart);    // Set up items normally taken care of by the constructor.    tokens = new Vector();    compileFormat(pattern);  }