java8 LocalDate擷取目前時間在年的第幾周

public static void main(String[] args) {
        LocalDate localDate = LocalDate.parse("2021-04-21");
//        第一個參數：一周的第一天，不能為空
//        第二個參數：第一周的最小天數，從1到7
        WeekFields weekFields = WeekFields.of(DayOfWeek.MONDAY, 1);
        int weekOfYear = localDate.get(weekFields.weekOfYear());
        System.out.println(weekOfYear);
    }