获取指定月份的所有工作日(工作日为自定义的)

/**
     *  获取指定月份的假日
     * @param month
     * @return
     */
    public static Map<String,Map<String,String>> getCustomDays(String month , String workdays ){

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        SimpleDateFormat dateFm = new SimpleDateFormat("EEEE");

        Map<String,Map<String,String>> res = new HashMap<>();
        // 1. 获取当前月所有的天
        Integer year = Integer.parseInt(month.substring(0,4));
        Integer months = Integer.parseInt(month.substring(4));

        Calendar start = Calendar.getInstance();

        start.set(year,months-1,1);
        List<String> days = new ArrayList<>();
        if(workdays.contains(",")){
              days= Arrays.asList(workdays.split(","));
        }else{
            days.add(workdays);
        }
        Map<String,String> outHoliday = new HashMap<>();

        List<String> workDay = new ArrayList<>();

        while (start.get(Calendar.MONTH) < months){
            Date date = start.getTime();
            String currSun = dateFm.format(date);

            days.forEach(e -> {
                if(e.equals(currSun)) {
                    workDay.add(sdf.format(start.getTime().clone()));
                    outHoliday.put(sdf.format(start.getTime().clone()),"0");
                }
            });
            start.add(Calendar.DATE,1);
        }

        res.put(month,outHoliday);
        return  res;
    }

public static void main(String[] args) {
    getCustomDays("202007","星期一,星期二,星期三");
}