code: public final void addEntries(Iterator<Entry<?>> entries) {
          if (entries != null) {
              while (entries.hasNext()) {
                  addEntry(entries.next());
              }
          }
      }
docs: Adds the entries returned by the iterator to the calendar. This is basically just a convenience
  method as the actual work of adding an entry to a calendar is done inside {@link Entry#setCalendar(Calendar)}.
  
  @param entries the entries to add