code: public List<Long> getModificationDates(List<RESOURCE> resources) {
  
          List<Long> result = new ArrayList<Long>();
          for (RESOURCE res : resources) {
              result.add(new Long(getDateLastModified(res)));
          }
          return result;
      }
docs: Given a list of resources, this method returns a list of their modification dates.<p>
  
  @param resources a list of resources
  
  @return the modification dates of the resources, in the same order as the resources