我的格子是问的我开学日期

java8的话使用新的data api很方便

 //开学日期
  LocalDate start = LocalDate.of(2015,9,7);
  WeekFields week = WeekFields.of(Locale.getDefault());
  int startWeek = start.get(week.weekOfWeekBasedYear());

  LocalDate today = LocalDate.now();
  WeekFields weekFields = WeekFields.of(Locale.getDefault());
  int todayWeek = today.get(weekFields.weekOfWeekBasedYear());

  int weeks = todayWeek-startWeek+1;
   System.out.println("当前是第"+weeks+"周");
        

刚写完这个功能。用户第一使用这个软件需要给个初始周，往后通过逻辑来给周增加

每次获取当前日期，然后和初始日期做比较就好