2
的名單,我有以下流:Java的8個流 - 子類型的演員表超類型
final List<List<ScheduleContainer>> scheduleIntervalContainerOfCurrentDay = new ArrayList<>(
unconfirmedScheduleIntervalContainersOfWeeks.stream()
.sorted(Comparator.comparing(ScheduleIntervalContainer::getStartDate).reversed())
.filter(s -> s.getStartDate().withTimeAtStartOfDay().isEqual(today.withTimeAtStartOfDay()))
.collect(Collectors.groupingBy(ScheduleIntervalContainer::getStartDate, LinkedHashMap::new, Collectors.toList())).values());
,並在年底,我會從List<ScheduleIntervalContainer>
類型的List
轉換爲List<ScheduleContainer>
類型的List
(ScheduleIntervalContainer是ScheduleContainer的子類型)。有沒有辦法做到這一點?