Java 根据列表 LocalDateTime 对象和已采取的带流的时隙列表创建可用时隙列表

对于这个问题，我简化了你的Timeslot课(for demonstration purposes)，因为对于这个任务，你主要关注timeslot中的start time和end time.

我的方法是通过从已经获取的timeslot个对象中提取start time个来创建一组LocalDateTime个对象(由第一个列表表示).

然后在query列表上创建一个流，并过滤集合中不存在的日期时间对象.然后使用每个日期时间对象创建一个timeslot作为start time(end time=start time+1小时).并将所有流元素收集到一个list中.

Note:终端操作toList()创建一个不可变列表，您可以通过应用collect(Collectors.toList())获得一个可变列表.

public static void main(String[] args) {
    List<LocalDateTime> query =
        List.of(LocalDateTime.of(2022, 04, 16, 8, 00),
                LocalDateTime.of(2022, 04, 16, 9, 00),
                LocalDateTime.of(2022, 04, 16, 10, 00),
                LocalDateTime.of(2022, 04, 16, 11, 00),
                LocalDateTime.of(2022, 04, 16, 12, 00),
                LocalDateTime.of(2022, 04, 16, 13, 00),
                LocalDateTime.of(2022, 04, 16, 14, 00),
                LocalDateTime.of(2022, 04, 16, 15, 00));

    List<Timeslot> timeslots = // timeslots that already taken
        List.of(new Timeslot(LocalDateTime.of(2022, 04, 16, 9, 00),
                             LocalDateTime.of(2022, 04, 16, 10, 00)),
                new Timeslot(LocalDateTime.of(2022, 04, 16, 10, 00),
                             LocalDateTime.of(2022, 04, 16, 11, 00)));
    
    Set<LocalDateTime> takenStartTime = timeslots.stream()
        .map(Timeslot::getStartTime)
        .collect(Collectors.toSet());

    List<Timeslot> availableSlots = query.stream()
        .filter(dateTime -> !takenStartTime.contains(dateTime))
        .map(dateTime -> new Timeslot(dateTime, dateTime.plusHours(1)))
        .toList();
    
    availableSlots.forEach(System.out::println);
}

简化假人Timeslot级

public class Timeslot {
    private LocalDateTime startTime;
    private LocalDateTime endTime;
    
    // constructor, getters, toString()
}

Output

Timeslot{start_time=2022-04-16T08:00, end_time=2022-04-16T09:00}
Timeslot{start_time=2022-04-16T11:00, end_time=2022-04-16T12:00}
Timeslot{start_time=2022-04-16T12:00, end_time=2022-04-16T13:00}
Timeslot{start_time=2022-04-16T13:00, end_time=2022-04-16T14:00}
Timeslot{start_time=2022-04-16T14:00, end_time=2022-04-16T15:00}
Timeslot{start_time=2022-04-16T15:00, end_time=2022-04-16T16:00}