gistfile1.java

List<PersonEntity> attendees = conference.getAttendees();
Collections.sort(new Comparator<PersonEntity> {
  @Override
  public int sort(PersonEntity person1, PersonEntity person2) {
    Date person1ArrivalDate = person1.getArrivalDate(),
         person2ArrivalDate = person2.getArrivalDate();
    if (person1ArrivalDate == null) person1ArrivalDate = DEFAULT_ARRIVAL_DATE;
    if (person2ArrivalDate == null) person2ArrivalDate = DEFAULT_ARRIVAL_DATE;
    int comparisonByArrivalDateResult = person1ArrivalDate.compareTo(person2ArrivalDate);
    if (comparisonByArrivalDateResult == 0) {
      TicketTier person1TicketTier = person1.getTicketTier(),
                 person2TicketTier = person2.getTicketTier();
      if (person1TicketTier == null) person1TicketTier = DEFAULT_TICKET_TIER;
      if (person2TicketTier == null) person2TicketTier = DEFAULT_TICKET_TIER;
      int comparisonByTicketTierResult = person1TicketTier.compareTo(person2TicketTier);
      if (comparisonByTicketTierResult == 0) {
        String person1LastName = person1.getLastName(),
               person2LastName = person2.getLastName();
        if (person1LastName == null) person1LastName = "";
        if (person2LastName == null) person2LastName = "";
        return person1LastName.compareTo(person2LastName);
      }
      return comparisonByTicketTierResult
    }
    return comparisonByArrivalDateResult;
  }
});