我的格子是問的我開學日期

java8的話使用新的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");
        

剛寫完這個功能。使用者第一個使用這個軟體需要給個初始週，往後透過邏輯來給週增加

每次取得目前日期，然後和初始日期做比較就好