code: public final void addEntries(Entry<?>... entries) {
          if (entries != null) {
              for (Entry<?> entry : entries) {
                  entry.setCalendar(this);
              }
          }
      }
docs: Adds the given entries 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