java 计算工作日

以下是 Java 中计算工作日的代码实现，包含节假日：

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;

public class WorkingDaysCalculator {

    // 节假日列表
    private static List<LocalDate> holidayList = new ArrayList<>();

    static {
        // 添加节假日，这里以2021年为例
        holidayList.add(LocalDate.of(2021, 1, 1)); // 元旦
        holidayList.add(LocalDate.of(2021, 2, 11)); // 春节
        holidayList.add(LocalDate.of(2021, 2, 12)); // 春节
        holidayList.add(LocalDate.of(2021, 2, 15)); // 春节
        holidayList.add(LocalDate.of(2021, 2, 16)); // 春节
        holidayList.add(LocalDate.of(2021, 2, 17)); // 春节
        holidayList.add(LocalDate.of(2021, 4, 5)); // 清明节
        holidayList.add(LocalDate.of(2021, 5, 1)); // 劳动节
        holidayList.add(LocalDate.of(2021, 5, 3)); // 劳动节
        holidayList.add(LocalDate.of(2021, 5, 4)); // 劳动节
        holidayList.add(LocalDate.of(2021, 6, 14)); // 端午节
        holidayList.add(LocalDate.of(2021, 9, 20)); // 中秋节
        holidayList.add(LocalDate.of(2021, 10, 1)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 2)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 3)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 4)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 5)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 6)); // 国庆节
        holidayList.add(LocalDate.of(2021, 10, 7)); // 国庆节
    }

    public static void main(String[] args) {
        LocalDate startDate = LocalDate.of(2021, 10, 1);
        LocalDate endDate = LocalDate.of(2021, 10, 31);
        int workingDays = countWorkingDays(startDate, endDate);
        System.out.println("Working days between " + startDate + " and " + endDate + ": " + workingDays);
    }

    public static int countWorkingDays(LocalDate startDate, LocalDate endDate) {
        int workingDays = 0;
        LocalDate currentDate = startDate;
        while (currentDate.isBefore(endDate) || currentDate.isEqual(endDate)) {
            if (currentDate.getDayOfWeek() != DayOfWeek.SATURDAY && currentDate.getDayOfWeek() != DayOfWeek.SUNDAY
                    && !holidayList.contains(currentDate)) {
                workingDays++;
            }
            currentDate = currentDate.plusDays(1);
        }
        return workingDays;
    }

}

在以上代码中，我们通过一个静态初始化块构建了节假日列表。然后，在`countWorkingDays`方法中，我们在每个循环迭代中检查当前日期是否是星期六、星期日或节假日。如果不是，计数器`workingDays`就会加一。最后，该方法返回计数器的值，即工作日的总数。