可以使用 Collectors#groupingBy 到组 LocalDateTime 对象以10分钟的间隔排列成列表。您必须修改此片段以与您的 Item 类，但逻辑是一样的。

List<LocalDateTime> myObjList = Arrays.asList(
    LocalDateTime.parse("2020-09-22T00:13:36"),
    LocalDateTime.parse("2020-09-22T00:17:20"),
    LocalDateTime.parse("2020-09-22T01:25:20"),
    LocalDateTime.parse("2020-09-18T00:17:20"),
    LocalDateTime.parse("2020-09-19T00:17:20")
);

System.out.println(myObjList.stream().collect(Collectors.groupingBy(time -> {
    // Store the minute-of-hour field.
    int minutes = time.getMinute();

    // Determine how many minutes we are above the nearest 10-minute interval.
    int minutesOver = minutes % 10;

    // Truncate the time to the minute field (zeroing out seconds and nanoseconds),
    // and force the number of minutes to be at a 10-minute interval.
    return time.truncatedTo(ChronoUnit.MINUTES).withMinute(minutes - minutesOver);
})));

输出

{
    2020-09-22T00:10=[2020-09-22T00:13:36, 2020-09-22T00:17:20],
    2020-09-19T00:10=[2020-09-19T00:17:20],
    2020-09-18T00:10=[2020-09-18T00:17:20],
    2020-09-22T01:20=[2020-09-22T01:25:20]
}

您没有指定组的键，所以我只使用 (minutes/10)*10 以获取标记到时间上的分钟范围的开始时间，将时间截断为小时。

List<Item> myObjList = Arrays.asList(
        new Item(LocalDateTime.parse("2020-09-22T00:13:36")),
        new Item(LocalDateTime.parse("2020-09-22T00:17:20")),
        new Item(LocalDateTime.parse("2020-09-22T01:25:20")),
        new Item(LocalDateTime.parse("2020-09-18T00:17:20")),
        new Item(LocalDateTime.parse("2020-09-19T00:17:20")));

Map<String, List<Item>> map = myObjList.stream()
        .collect(Collectors.groupingBy(item -> {
            int range =
                    (item.getTime().getMinute() / 10) * 10;
            return item.getTime()
                    .truncatedTo(ChronoUnit.HOURS).plusMinutes(range) +
                    " - " + (range + 9) + ":59";
        }));

map.entrySet().forEach(System.out::println);

印刷品

2020-09-22T00:10 - 19:59=[2020-09-22T00:13:36, 2020-09-22T00:17:20]
2020-09-19T00:10 - 19:59=[2020-09-19T00:17:20]
2020-09-18T00:10 - 19:59=[2020-09-18T00:17:20]
2020-09-22T01:20 - 29:59=[2020-09-22T01:25:20]

这是我上过的课。

class Item {
    LocalDateTime ldt;

    public Item(LocalDateTime ldt) {
        this.ldt = ldt;
    }

    public String toString() {
        return ldt.toString();
    }

    public LocalDateTime getTime() {
        return ldt;
    }
}