如何获得本年度一周的总人数 [英] how to get total number of week in the current year

问题描述

我有以下code对计算器这回在当年周的总数，但很难codeD which'll不是在2014年和2016年工作，我怎么会在本年度星期总数动态???

 日历CAL = Calendar.getInstance（）;
cal.set（Calendar.YEAR，2015年）;
cal.set（Calendar.MONTH，Calendar.DECEMBER）;
cal.set（Calendar.DAY_OF_MONTH，31）;

INT ordinalDay = cal.get（Calendar.DAY_OF_YEAR）;
INT平日= cal.get（Calendar.DAY_OF_WEEK） -  1; //星期日= 0
INT numberOfWeeks =（ordinalDay  - 平日+ 10）/ 7;
的System.out.println（numberOfWeeks）;






    我不喜欢这只是检查是目前的方法？

       日历CAL = Calendar.getInstance（）;
     INT年= cal.get（Calendar.YEAR）;
     cal.set（Calendar.YEAR，一年）;
     cal.set（Calendar.MONTH，Calendar.DECEMBER）;
     cal.set（Calendar.DAY_OF_MONTH，31）;

     INT ordinalDay = cal.get（Calendar.DAY_OF_YEAR）;
     INT平日= cal.get（Calendar.DAY_OF_WEEK） -  1; //星期日= 0
     INT numberOfWeeks =（ordinalDay  - 平日+ 10）/ 7;
     的System.out.println（numberOfWeeks）;
 

解决方案

使用下面的code

 日历mCalendar =新的GregorianCalendar（）;
mCalendar.set（Calendar.YEAR，2014年）; //设置仅一年
mCalendar.set（Calendar.MONTH，12）; //不要改变
mCalendar.set（Calendar.DAY_OF_MONTH，31）; //不要改变
INT totalWeeks = mCalendar.get（Calendar.WEEK_OF_YEAR）;
 

不要在乎30，28 29天一个月。最后一天一年（任何一年）始终是12月31日所以，你需要的那一天设置。而 mCalendar.get（Calendar.WEEK_OF_YEAR）返回周总在这一年。的

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更新动态的方式的

 私人诠释getTotalWeeksInYear（INT年）{
        日历mCalendar =新的GregorianCalendar（）;
        mCalendar.set（Calendar.YEAR，一年）; //设置仅一年
        mCalendar.set（Calendar.MONTH，12）; //不要改变
        mCalendar.set（Calendar.DAY_OF_MONTH，31）; //不要改变
        返回mCalendar.get（Calendar.WEEK_OF_YEAR）;
    }

    //调用作为
    INT totalWeeks = getTotalWeeksInYear（2014年）;
 

---

寻找在上述code错误。到时候，你可以使用下面code，它是工作的罚款

 私人诠释getTotalWeeksInYear（INT年）{
        日历mCalendar =新的GregorianCalendar（TimeZone.getDefault（））;
        mCalendar.setFirstDayOfWeek（Calendar.MONDAY）;
        //解决方法
        mCalendar.set（年，
                Calendar.DECEMBER，
                31）;
        INT totalDaysInYear = mCalendar.get（Calendar.DAY_OF_YEAR）;
        的System.out.println（totalDaysInYear）;
        INT totalWeeks = totalDaysInYear / 7;
        返回totalWeeks;
    }
 

I got below code on stackoverflow which return total number of week in current year, but it is hardcoded which'll not work on 2014 and 2016. How I get total number of week in current year dynamically???

Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2015);
cal.set(Calendar.MONTH, Calendar.DECEMBER);
cal.set(Calendar.DAY_OF_MONTH, 31);

int ordinalDay = cal.get(Calendar.DAY_OF_YEAR);
int weekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; // Sunday = 0
int numberOfWeeks = (ordinalDay - weekDay + 10) / 7;
System.out.println(numberOfWeeks);






    i did like this just check it is current method?

       Calendar cal = Calendar.getInstance();
     int year = cal.get(Calendar.YEAR);
     cal.set(Calendar.YEAR, year);
     cal.set(Calendar.MONTH, Calendar.DECEMBER);
     cal.set(Calendar.DAY_OF_MONTH, 31);

     int ordinalDay = cal.get(Calendar.DAY_OF_YEAR);
     int weekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; // Sunday = 0
     int numberOfWeeks = (ordinalDay - weekDay + 10) / 7;
     System.out.println(numberOfWeeks);

解决方案

Use the below code

Calendar mCalendar = new GregorianCalendar(); 
mCalendar.set(Calendar.YEAR, 2014); // Set only year 
mCalendar.set(Calendar.MONTH, 12); // Don't change
mCalendar.set(Calendar.DAY_OF_MONTH, 31); // Don't change
int totalWeeks = mCalendar.get(Calendar.WEEK_OF_YEAR);

Don't care about 30, 28 and 29 days of month. Last day of a year (Any year) is always 31 Dec. So you need to set that day. And mCalendar.get(Calendar.WEEK_OF_YEAR) will return the total weeks in that year.

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Update for dynamic way

private int getTotalWeeksInYear(int year) {
        Calendar mCalendar = new GregorianCalendar(); 
        mCalendar.set(Calendar.YEAR, year); // Set only year 
        mCalendar.set(Calendar.MONTH, 12); // Don't change
        mCalendar.set(Calendar.DAY_OF_MONTH, 31); // Don't change
        return mCalendar.get(Calendar.WEEK_OF_YEAR);
    }

    // Call as
    int totalWeeks = getTotalWeeksInYear(2014);

---

Looking for bug in above code. By the time you can use below code that is working fine

private int getTotalWeeksInYear(int year) {
        Calendar mCalendar = new GregorianCalendar(TimeZone.getDefault()); 
        mCalendar.setFirstDayOfWeek(Calendar.MONDAY);
        // Workaround
        mCalendar.set(year, 
                Calendar.DECEMBER, 
                31);
        int totalDaysInYear = mCalendar.get(Calendar.DAY_OF_YEAR);
        System.out.println(totalDaysInYear);
        int totalWeeks = totalDaysInYear / 7; 
        return totalWeeks;
    }

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