//獲取某一年的某一週的週日日期
public static Date getEndDayOfWeekNo(int year, int weekNo) throws ParseException {
    Calendar cal = getCalendarFormYear(year);
    cal.set(Calendar.WEEK_OF_YEAR, weekNo);
    cal.add(Calendar.DAY_OF_WEEK, 6);
    //獲得SimpleDateFormat類，我們轉換為yyyy-MM-dd的時間格式
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");//注意月份是MM
 

    String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
            cal.get(Calendar.DAY_OF_MONTH);
    Date date= java.sql.Date.valueOf(start);
    return date;}
//獲取某一年的某一週的週一日期
public static Date getStartDayOfWeekNo(int year, int weekNo) throws ParseException {
    Calendar cal = getCalendarFormYear(year);
 

    cal.set(Calendar.WEEK_OF_YEAR, weekNo);
    //獲得SimpleDateFormat類，我們轉換為yyyy-MM-dd的時間格式
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");//注意月份是MM
    String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
            cal.get(Calendar.DAY_OF_MONTH);
    Date date= java.sql.Date.valueOf(start);
 

    return date;
}