按创建时间按天分组

huang_hai_an

于 2023-10-30 10:38:28 发布

阅读量226

点赞数

文章标签： java

本文链接：https://blog.youkuaiyun.com/huang_hai_an/article/details/134114082

版权

按创建时间按天分组

 List<Date> dates = orderRecords.stream().map(Order::getCreated).collect(Collectors.toList());
            Map<LocalDate, List<LocalDate>> groupedDates = dates.stream().map(date -> date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate())
                    .collect(Collectors.groupingBy(date -> date));
            List<LocalDate> createDates = new ArrayList<>(groupedDates.keySet());
            createDates.sort(Comparator.comparing(LocalDate::toEpochDay));