Java 获取当天0点到23点的小时字符串类型集合

可以使用Java 8中的Stream API和DateTimeFormatter类来获取当天0点到23点的小时字符串类型集合。下面是示例代码：

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class HourList {

    public static void main(String[] args) {

        // 获取当前时间
        LocalDateTime now = LocalDateTime.now();

        // 定义时间格式化器
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        // 获取当天0点时间
        LocalDateTime startOfDay = now.withHour(0).withMinute(0).withSecond(0).withNano(0);

        // 获取当天0点到23点的小时字符串类型集合
        List<String> hourList = IntStream.range(0, 24)
                .mapToObj(hour -> startOfDay.plusHours(hour).format(formatter))
                .collect(Collectors.toList());

        // 打印结果
        System.out.println(hourList);
    }
}

输出结果为：

[2022-02-21 00:00:00, 2022-02-21 01:00:00, 2022-02-21 02:00:00, 2022-02-21 03:00:00, 2022-02-21 04:00:00, 2022-02-21 05:00:00, 2022-02-21 06:00:00, 2022-02-21 07:00:00, 2022-02-21 08:00:00, 2022-02-21 09:00:00, 2022-02-21 10:00:00, 2022-02-21 11:00:00, 2022-02-21 12:00:00, 2022-02-21 13:00:00, 2022-02-21 14:00:00, 2022-02-21 15:00:00, 2022-02-21 16:00:00, 2022-02-21 17:00:00, 2022-02-21 18:00:00, 2022-02-21 19:00:00, 2022-02-21 20:00:00, 2022-02-21 21:00:00, 2022-02-21 22:00:00, 2022-02-21 23:00:00]