public void start() {
		if (state == EnumStopWatchState.STOP) {
			timer = new Timer(NAME);
			timer.scheduleAtFixedRate(this, 0, 1000);
			state = EnumStopWatchState.RUNNING;
			log.info("start stopwatch, it's state:" + state + ", elapseTime:"
					+ elapseTime);
		}
	}