如何获得日期和时间的差值以及日期的总和？

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class DateCalculation {
    public static void main(String[] args) {
        // 获取起始日期和结束日期的输入
        String startDateStr = "2022-01-01";
        String endDateStr = "2022-01-10";

        // 将起始日期和结束日期转换为日期对象
        LocalDate startDate = LocalDate.parse(startDateStr);
        LocalDate endDate = LocalDate.parse(endDateStr);

        // 计算日期和时间的差值
        long daysDiff = ChronoUnit.DAYS.between(startDate, endDate);
        long hoursDiff = ChronoUnit.HOURS.between(startDate.atStartOfDay(), endDate.atStartOfDay());

        System.out.println("日期差值：" + daysDiff + "天");
        System.out.println("时间差值：" + hoursDiff + "小时");

        // 计算日期的总和
        long totalDays = ChronoUnit.DAYS.between(startDate, endDate) + 1; // 包括起始日期和结束日期
        System.out.println("日期总和：" + totalDays + "天");
    }
}