日历中的星期一问题

 Calendar calendar = new GregorianCalendar() ;

        Date nowDate = new Date() ;

        calendar.setTime(nowDate);

        boolean isSunday =  calendar.getFirstDayOfWeek() == Calendar.SUNDAY ;

        //获取今天是星期的第几天

        int dayInWeek = calendar.get(Calendar.DAY_OF_WEEK) ;

        if (isSunday){

            dayInWeek = dayInWeek - 1 ;

            if (dayInWeek == 0){

                dayInWeek = 7 ;

            }

        }