code: public String getMilliseconds() {
          if (myTimerIsRunning) {
              throw new IllegalStateException(LOGGER.getI18n(MessageCodes.UTIL_042));
          }
  
          return new StringBuilder().append(myStop - myStart).append(" msecs").toString();
      }
docs: Express the "reading" on the stopwatch in milliseconds.
  
  @return Time elapsed in stopwatch in milliseconds
  @throws IllegalStateException if the Stopwatch has never been used, or if the stopwatch is still running.