Get the month collection of start time and end time

Business requirements: the database has a start and end time, find consecutive months between this
method:
Calendar.getInstance () can not only get the current time, but also specify the time point to be obtained

 public  List<String> getMonthBetween(Date minDate, Date maxDate)  {
        ArrayList<String> result = new ArrayList<String>();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");//格式化为年月

        Calendar min = Calendar.getInstance();
        Calendar max = Calendar.getInstance();

        min.setTime(minDate);
        min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);

        max.setTime(maxDate);
        max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);

        Calendar curr = min;
        while (curr.before(max)) {
            result.add(sdf.format(curr.getTime()));
            curr.add(Calendar.MONTH, 1);
        }
        return result;
    }

Among them, the incoming format: 2019-03-02
Return format: 2019-03-02