java 实现请假开始时间、请假结束时间算出天数，节假日不算

以下是 Java 实现请假开始时间、请假结束时间算出天数，节假日不算的示例代码：

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.HashSet;
import java.util.Set;

public class LeaveDaysCalculator {
    private Set<LocalDate> holidays;

    public LeaveDaysCalculator() {
        holidays = new HashSet<>();
        // 将节假日加入到集合中
        holidays.add(LocalDate.of(2021, 10, 1));
        holidays.add(LocalDate.of(2021, 10, 2));
        holidays.add(LocalDate.of(2021, 10, 3));
        holidays.add(LocalDate.of(2021, 10, 4));
        holidays.add(LocalDate.of(2021, 10, 5));
        holidays.add(LocalDate.of(2021, 10, 6));
        holidays.add(LocalDate.of(2021, 10, 7));
    }

    public int calculateLeaveDays(LocalDate startDate, LocalDate endDate) {
        int leaveDays = (int) ChronoUnit.DAYS.between(startDate, endDate) + 1;
        // 排除节假日
        for (LocalDate date = startDate; date.isBefore(endDate.plusDays(1)); date = date.plusDays(1)) {
            if (date.getDayOfWeek().getValue() >= 6 || holidays.contains(date)) {
                leaveDays--;
            }
        }
        return leaveDays;
    }

    public static void main(String[] args) {
        LeaveDaysCalculator calculator = new LeaveDaysCalculator();
        LocalDate startDate = LocalDate.of(2021, 10, 8);
        LocalDate endDate = LocalDate.of(2021, 10, 15);
        int leaveDays = calculator.calculateLeaveDays(startDate, endDate);
        System.out.println("请假天数：" + leaveDays);
    }
}

在示例代码中，我们使用了 Java 8 中的 LocalDate 类来处理日期，使用 ChronoUnit.DAYS.between() 方法计算请假天数。在计算请假天数时，我们遍历请假期间的每一天，如果该天是周六、周日或者节假日，则将请假天数减一。