Question

我需要获得前一周的号码。例如。这是第38周，我需要第37周。如何最好地继续？

int currentWeekNumber= now.get(Calendar.WEEK_OF_YEAR);
int previousWeekNum = // How to get the previous week number??

    System.out.println("currentWeekNum = " + currentWeekNumber);
    System.out.println(" previousWeekNum = " + previousWeekNum);

Answer 1

这对我来说很好....这是获得它的正确语法

Calendar now = Calendar.getInstance();

    int currentWeek = now.get(Calendar.WEEK_OF_YEAR);
    System.out.println("current week = " + currentWeek);

now.add(Calendar.WEEK_OF_YEAR, -1);
    int test = now.get(Calendar.WEEK_OF_YEAR);
    System.out.println(" test date = " + test);

Answer 2

-1会正常工作吗？

 System.out.println("currentWeekNum = " + currentWeekNumber);
 System.out.println("previousWeekNum = " + currentWeekNumber-1);

旁注：不要忘记检查当前周是否是第一周：）

由于上述解决方案不够模糊，而且正如其他人指出的那样（您也发现），请使用日历的添加方法，这样更准确。

cal.add(Calendar.WEEK_OF_YEAR, -1); //Then use this instance.
int preveWeekNum = cal.get(Calendar.WEEK_OF_YEAR);

Answer 3

唯一正确的方法似乎是：

cal.add(Calendar.WEEK_OF_YEAR, -1);
int previousWeekNum = cal.get(Calendar.WEEK_OF_YEAR);

Answer 4

您正在获得当前周数。然后currentWeek -1将给出前一周。

int previousWeekNum = 0;
calender.add(Calendar.WEEK_OF_YEAR, -1);
previousWeekNum = calender.get(Calendar.WEEK_OF_YEAR);

如何获得前一周的数字

4 个答案: