如何计算java中任何月份的工作日数？

如何计算java中任何月份的工作日数？我的输入是以整数表示的月份。 例如，要获得9月份的工作日数，我的输入是9。

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我没有开始或结束日期。周末是周六和周日。请帮助。

这种方法可能不是最理想的，但至少可以避免任何循环。我试着逐字逐句地解决它，所以这里是总体思路，希望它适合你：

static int countHolidays(int month){
    //assuming month is 1-12
    Calendar firstDayCal = Calendar.getInstance();
    Calendar lastDayCal = Calendar.getInstance();
    firstDayCal.set(Calendar.MONTH, month-1);//here we should put 0-11;
    lastDayCal.set(Calendar.MONTH, month-1);
    int firstDay = firstDayCal.getActualMinimum(Calendar.DAY_OF_MONTH);
    int lastDay = firstDayCal.getActualMaximum(Calendar.DAY_OF_MONTH);
    firstDayCal.set(Calendar.DAY_OF_MONTH, firstDay);
    lastDayCal.set(Calendar.DAY_OF_MONTH, lastDay);
    //any month have no less than 28 days, so 4 full weeks - so 8 weekends.
    int total = 8;
    switch (lastDay) {
        case 29:
            //leap-year february can have one extra holiday if it starts on sunday or ends on saturday
            if ((firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) || (lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)){
                total++;
            }   break;
        case 30:
            //30-day month can have one extra holiday if it starts on sunday or ends on saturday...
            if ((firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) || (lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)){
                total++;
            //...or two extra holiday if it starts on saturday or ends on sunday
            } else if ((firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY) || (lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)){
                total = total + 2;
            }   break;
        case 31:
            //31-day month can have one extra holiday if it starts on sunday or ends on saturday...
            if ((firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) || (lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)){
                total++;
            //...or two extra holiday if it starts on (friday or saturday) or ends on (sunday or monday)
            } else if (((firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.FRIDAY) || (firstDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)) ||
                    ((lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) || (lastDayCal.get(Calendar.DAY_OF_WEEK) == Calendar.MONDAY))) {
                total = total + 2;
            }   break;
        default:
            break;
    }
    return lastDay-total;//as we need workingDays, not weekends        
}

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请提供您的代码以获取准确的数据，您还需要输入

年份

您必须考虑到国家假日吗？您唯一输入的是

整数

形式的月份，这意味着您只对当前年份感兴趣，对吗？请参阅