Java 对象去重技巧

Question

public static List<DemandLocationDTO> distinctLocation(List<DemandLocationDTO> demandLocationDtoList){
  Set<DemandLocationDTO> set = new TreeSet<>((one, two) -> {
    int compareToResult = 1;
    if (StringUtils.equals(one.getProvinceCode(), two.getProvinceCode())
        && StringUtils.equals(one.getCityCode(), two.getCityCode())
        && StringUtils.equals(one.getDistrictCode(), two.getDistrictCode())
        && Objects.equals(one.getMarketId(), two.getMarketId())) {
      compareToResult = 0;
    }
    return compareToResult;
  });
  set.addAll(demandLocationDtoList);
  return new ArrayList<>(set);
}