java判斷簡單判斷工作日還是周末日還是周末

//工作日還是周末
    private boolean checkTimeIsWork() {
        boolean flag = false;
        try {
            DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            String date = sdf.format(new Date());
            Date testdate = sdf.parse(date);
            Calendar cal = Calendar.getInstance();
            cal.setTime(testdate);
            int x = cal.get(Calendar.DAY_OF_WEEK);
            switch (x) {
                case Calendar.MONDAY:
                case Calendar.TUESDAY:
                case Calendar.WEDNESDAY:
                case Calendar.THURSDAY:
                case Calendar.FRIDAY:
                    flag = false;
                    break;
                case Calendar.SATURDAY:
                case Calendar.SUNDAY:
                    flag = true;
                    break;
            }

        } catch (ParseException e) {
            e.printStackTrace();
        }
        return flag;
    }