使用Java8对LocalDateTime对象进行间隔分组

import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class LocalDateTimeGrouping {
    public static void main(String[] args) {
        // 创建包含LocalDateTime对象的列表
        List<LocalDateTime> dateTimeList = Arrays.asList(
                LocalDateTime.of(2022, 1, 1, 10, 0),
                LocalDateTime.of(2022, 1, 1, 12, 0),
                LocalDateTime.of(2022, 1, 2, 9, 0),
                LocalDateTime.of(2022, 1, 2, 14, 0),
                LocalDateTime.of(2022, 1, 3, 11, 0),
                LocalDateTime.of(2022, 1, 3, 15, 0)
        );

        // 使用Java8的Stream API对列表进行处理
        Map<LocalDateTime, List<LocalDateTime>> groupedMap = dateTimeList.stream()
                .sorted()
                .collect(Collectors.groupingBy(LocalDateTime::toLocalDate));

        // 输出分组结果
        groupedMap.forEach((key, value) -> {
            System.out.println("日期：" + key);
            System.out.println("分组结果：" + value);
            System.out.println();
        });
    }
}