Question

StartDate:  2016-05-8 20:16:00;
EndDate:    2016-05-30 20:16:00;


     public int saturdaysundaycount(Date d1, Date d2) {
                Calendar c1 = Calendar.getInstance();
                c1.setTime(d1);

                Calendar c2 = Calendar.getInstance();
                c2.setTime(d2);

                int sundays = 0;
                int saturday = 0;

                while (c1.after(c2)) {
                    if (c2.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY || c2.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
                        sundays++;
                    saturday++;
                    c2.add(Calendar.DATE, 1);
                    c2.add(Calendar.DATE, 1);
                }
                System.out.println(sundays);

                return saturday + sundays;
            }

在这个函数中，我试图得到两个日期之间的星期六和星期日的总数。但是当我通过日期时，结果我得到零。请指出错误并建议更正。

Answer 1

不建议编写完整的程序，但既然你付出了努力，这就是我的系统似乎正在工作并返回7的值。

public class CountWeekends {

    public static void main(String[] args){

        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        int count = 0;
        try {
            Date d1 = formatter.parse("2016-05-8 20:16:00");
            Date d2 = formatter.parse("2016-05-30 20:16:00");
            count = saturdaysundaycount(d1,d2);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        System.out.println("Count of Sats & Sundays = "+count);
    }

    public static int saturdaysundaycount(Date d1, Date d2) {
        Calendar c1 = Calendar.getInstance();
        c1.setTime(d1);

        Calendar c2 = Calendar.getInstance();
        c2.setTime(d2);

        int sundays = 0;
        int saturday = 0;

        while (! c1.after(c2)) {
            if (c1.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY ){
                saturday++; 
            }
            if(c1.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY){
                sundays++;
            }

            c1.add(Calendar.DATE, 1);
        }

        System.out.println("Saturday Count = "+saturday);
        System.out.println("Sunday Count = "+sundays);
        return saturday + sundays;
    }

逻辑：您需要将增量start date保持一天，直到它为止超过end date并继续检查day上的start date。

Answer 2

问题出在while，这段代码对我来说很合适。

检查endDate和startDate，因为我猜您是以错误的顺序发送它。

while (endDate.after(startDate)) {
  if (endDate.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY ){
    sundays++;
  }else if (endDate.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY){
    saturday++;
  }

  endDate.add(Calendar.DATE, -1);
}

Answer 3

public static int getNumberofSundays(String d1,String d2) throws Exception{ //object in Date form
    Date date1=getDate(d1);
    Date date2=getDate(d2);

    Calendar c1=Calendar.getInstance();
    c1.setTime(date1);
    Calendar c2=Calendar.getInstance();
    c2.setTime(date2);
    int sundays=0;
    while(c1.after(c2)){
        if(c2.get(Calendar.DAY_OF_WEEK)==Calendar.SUNDAY){
            sundays++;
            c2.add(Calendar.DATE,1);
        }
    }
    System.out.println("number of days between 2 dates"+sundays);

    return sundays;
}

Answer 4

你的代码并没有循环过去。请尝试以下代码。在while循环中，它循环遍历给定的第一个日期和最后一个日期之间的所有日期。它通过在每次迭代中向c1添加一天直到c1在c2之后来实现。这给出了给定日期（包括那两天）之间的星期六和星期日的数量。

public static int saturdaysundaycount(Date d1, Date d2) {
    Calendar c1 = Calendar.getInstance();
    c1.setTime(d1);

    Calendar c2 = Calendar.getInstance();
    c2.setTime(d2);

    int sundays = 0;
    int saturdays = 0;

    while (!c1.after(c2)) {
        SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd-E");
        String formatted = format1.format(c1.getTime());
        System.out.println("Current Date C1 : " + formatted);

        if (c1.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            sundays++;
        } else if (c1.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY) {
            saturdays++;
        }
        c1.add(Calendar.DATE, 1);
    }

    System.out.println("Sundays : " + sundays);
    System.out.println("Saturdays : " + saturdays);

    return saturdays + sundays;
}

如何在java中的两个日期之间获得星期六和星期日

4 个答案: