java - 获取特定月份的工作日数

我想获取特定月份的工作天数

在我的情况下，周末是星期五和星期六

我使用此代码：

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class TestWeekDay {

    /**
     * @param args
     * @throws ParseException
     */
    public static void main(String[] args) throws ParseException {

        // TODO Auto-generated method stub


        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
        String dateInString = "01-07-2016";
        Date startDate = sdf.parse(dateInString);
        String dateInString2 = "31-07-2016";
        Date endDate = sdf.parse(dateInString2);
        calculateDuration(startDate,endDate);

    }



    public static int calculateDuration(Date startDate, Date endDate)
    {
      Calendar startCal = Calendar.getInstance();
      startCal.setTime(startDate);

      Calendar endCal = Calendar.getInstance();
      endCal.setTime(endDate);

      int workDays = 0;

      if (startCal.getTimeInMillis() > endCal.getTimeInMillis())
      {
        startCal.setTime(endDate);
        endCal.setTime(startDate);
      }

      do
      {
        startCal.add(Calendar.DAY_OF_MONTH, 1);
        if (startCal.get(Calendar.DAY_OF_WEEK) != Calendar.FRIDAY && startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY)
        {
          workDays++;
        }
      }
      while (startCal.getTimeInMillis() <= endCal.getTimeInMillis());

      return workDays;
    }

}

例如，当我测试7月时，我有22，正确的答案应该是21

最佳答案

我认为您的问题可能是由边界条件引起的，该边界条件导致评估前每个月增加一天的时间。在增加实际日期之前，请先尝试执行星期几检查。

while (startCal.getTimeInMillis() <= endCal.getTimeInMillis()) {
    if (startCal.get(Calendar.DAY_OF_WEEK) != Calendar.FRIDAY &&
        startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY) {

        workDays++;
    }

    startCal.add(Calendar.DAY_OF_MONTH, 1);
}