自定義對象list，指定字段去重

public List<ZmxxNew> getGateList() {
    List<ZmxxNew> list = gateDao.findAll();
    List<ZmxxNew> unique =
        list.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(ZmxxNew::getStcd))), ArrayList::new));
    return unique;
}