## 如何获得·一个月的星期数？内容来源于 Stack Overflow，并遵循CC BY-SA 3.0许可协议进行翻译与使用

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```            //FIRST_DAY_OF_WEEK =0;
int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
int firstDay = (int) month.get(Calendar.DAY_OF_WEEK);
int firstDayNextMonth = nextMonth.get(Calendar.DAY_OF_WEEK);
int lastDayNextMonth=nextMonth.getActualMaximum(Calendar.DAY_OF_MONTH);
int nextMonthdays=nextMonth.getMinimalDaysInFirstWeek();

// figure size of the array
if (firstDay == 1) {
days = new String[lastDay + (FIRST_DAY_OF_WEEK * 6)];
}

else {
days = new String[lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1)];
}```

### 2 个回答

Calendar类的WEEK_OF_YEAR属性可能对您有用。Ref：日历课程

``````        Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2013);
cal.set(Calendar.MONTH, 1);
cal.set(Calendar.DAY_OF_MONTH, 1);
int start = cal.get(Calendar.WEEK_OF_YEAR);
Log.d("BLA BLA", "Value is " + start);
cal.set(Calendar.YEAR, 2013);
cal.set(Calendar.MONTH, 1);
cal.set(Calendar.DAY_OF_MONTH, 28);
int end = cal.get(Calendar.WEEK_OF_YEAR);
//Above line will not work for December Month, use following line for this
int end = isDecember?53:cal.get(Calendar.WEEK_OF_YEAR);
Log.d("BLA BLA", "Value is " + end);
Log.d("BLA BLA", "Num weeks:: " + (end - start +1 ));
``````

``````        Calendar cal = Calendar.getInstance();
for(int i = 0 ; i < 11;i++){
cal.set(Calendar.YEAR, 2013);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.MONTH, i);
int maxWeeknumber = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
Log.d("LOG","max week number" + maxWeeknumber);
}

01-22 01:49:03.591: D/LOG(573): max week number5
01-22 01:49:03.602: D/LOG(573): max week number5
01-22 01:49:03.602: D/LOG(573): max week number6
01-22 01:49:03.671: D/LOG(573): max week number5
01-22 01:49:03.671: D/LOG(573): max week number5
01-22 01:49:03.671: D/LOG(573): max week number6
01-22 01:49:03.681: D/LOG(573): max week number5
01-22 01:49:03.691: D/LOG(573): max week number5
01-22 01:49:03.691: D/LOG(573): max week number5
01-22 01:49:03.711: D/LOG(573): max week number5
01-22 01:49:03.711: D/LOG(573): max week number5
``````

``````        Calendar cal = Calendar.getInstance();
for(int i = 0 ; i < 11;i++){
cal.set(Calendar.YEAR, 2010);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.MONTH, i);
int maxWeeknumber = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
// Month value starts from 0 to 11 for Jan to Dec
Log.d("LOG","For Month :: "+ i + " Num Week :: " + maxWeeknumber);
}
``````

``````        01-22 01:59:35.841: D/LOG(629): For Month :: 0 Num Week :: 6
01-22 01:59:35.841: D/LOG(629): For Month :: 1 Num Week :: 5
01-22 01:59:35.841: D/LOG(629): For Month :: 2 Num Week :: 5
01-22 01:59:35.841: D/LOG(629): For Month :: 3 Num Week :: 5
01-22 01:59:35.841: D/LOG(629): For Month :: 4 Num Week :: 6
01-22 01:59:35.852: D/LOG(629): For Month :: 5 Num Week :: 5
01-22 01:59:35.871: D/LOG(629): For Month :: 6 Num Week :: 5
01-22 01:59:35.871: D/LOG(629): For Month :: 7 Num Week :: 5
01-22 01:59:35.871: D/LOG(629): For Month :: 8 Num Week :: 5
01-22 01:59:35.871: D/LOG(629): For Month :: 9 Num Week :: 6
01-22 01:59:35.871: D/LOG(629): For Month :: 10 Num Week :: 5
``````

``````public static void main(String[] args) throws Exception {
for (String m : new String[] { "2012-11", "2012-12", "2013-01", "2013-02", "2013-03",
"2013-04", "2013-05", "2013-06" }) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM");
Date date = format.parse(m);
Calendar c = Calendar.getInstance();
c.setTime(date);

int start = c.get(Calendar.WEEK_OF_MONTH);

c.add(Calendar.MONTH, 1);
c.add(Calendar.DATE, -1);
int end = c.get(Calendar.WEEK_OF_MONTH);
System.out.println(" # of weeks in " + format.format(c.getTime())
+ ": " + (end - start + 1));
}
}
``````

``````# of weeks in 2012-11: 5
# of weeks in 2012-12: 6
# of weeks in 2013-01: 5
# of weeks in 2013-02: 5
# of weeks in 2013-03: 6
# of weeks in 2013-04: 5
# of weeks in 2013-05: 5
# of weeks in 2013-06: 6
``````