得到指定年份的所有周末

/**
* 得到指定年份的所有周末
*/
public static List<Date> getWeekDayList(int year) {
List<Date> listDate = new ArrayList<Date>();
int i = 1;
        Calendar calendar = new GregorianCalendar(year, 0, 1);
       
        while (calendar.get(Calendar.YEAR) < year + 1) {
            calendar.set(Calendar.WEEK_OF_YEAR, i++);
         
            calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
            if (calendar.get(Calendar.YEAR) == year) {
            listDate.add(calendar.getTime());
            }
            calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
            if (calendar.get(Calendar.YEAR) == year) {
            listDate.add(calendar.getTime());
            }
        }
        return listDate;
    }