java - Calendar.WEEK_OF_YEAR 无法正常工作

Question

Calendar.WEEK_OF_YEAR 无法正常工作。我的目标是每个星期一都是新的一周。我得到的结果在代码注释中。

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我的代码是:

Calendar cal = Calendar.getInstance();
//cal.setMinimalDaysInFirstWeek(7);
//cal.setFirstDayOfWeek(0);
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

Date d = sdf.parse("27/12/2014"); //SAT
Date d1 = sdf.parse("28/12/2014"); //SUN

cal.setTime(d);
Integer weekNumber1 = cal.get(Calendar.WEEK_OF_YEAR);

cal.setTime(d1);
Integer weekNumber2 = cal.get(Calendar.WEEK_OF_YEAR);

System.out.println( weekNumber1 );// 52 
System.out.println( weekNumber2 );// 1`

第二个:

Calendar cal = Calendar.getInstance();
cal.setMinimalDaysInFirstWeek(7);
//cal.setFirstDayOfWeek(0);
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

Date d = sdf.parse("27/12/2014"); //SAT
Date d1 = sdf.parse("28/12/2014"); //SUN

cal.setTime(d);
Integer weekNumber1 = cal.get(Calendar.WEEK_OF_YEAR);

cal.setTime(d1);
Integer weekNumber2 = cal.get(Calendar.WEEK_OF_YEAR);

System.out.println( weekNumber1 );// 51 
System.out.println( weekNumber2 );// 52

第三个:

Calendar cal = Calendar.getInstance();
cal.setMinimalDaysInFirstWeek(7);
cal.setFirstDayOfWeek(0);
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

Date d = sdf.parse("27/12/2014"); //SAT
Date d1 = sdf.parse("28/12/2014"); //SUN
Date d2 = sdf.parse("29/12/2014"); //Mon

cal.setTime(d);
Integer weekNumber1 = cal.get(Calendar.WEEK_OF_YEAR);

cal.setTime(d1);
Integer weekNumber2 = cal.get(Calendar.WEEK_OF_YEAR);

cal.setTime(d2);
Integer weekNumber3 = cal.get(Calendar.WEEK_OF_YEAR);

System.out.println( weekNumber1 );// 52
System.out.println( weekNumber2 );// 52
System.out.println( weekNumber3 );// 52

Answer 1

您必须将星期一设置为日历一周的第一天。

cal.setFirstDayOfWeek(Calendar.MONDAY);