docs: public void addAll(long timestamp, List<T> objectList) {
  		for (T object : objectList)
  			add(timestamp, object);
  	}
  
  	/*
  	 * (non-Javadoc)
       *
       * @see kr.jm.utils.collections.JMTimeSeries#toString()
       */
  	@Override
  	public String toString() {
  		return "JMListTimeSeries(intervalSeconds=" + getIntervalSeconds()
  				+ ", timeSeriesMap=" + timeSeriesMap.toString() + ")";
  	}
  
  }