对日期区间进行遍历（步长为一天为例）

对日期区间进行遍历（步长为一天为例）

    public static void main(String[] args) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        Date startDate = null;
        Date endDate = null;

        try {
            startDate = format.parse("2020-10-01");
            endDate = format.parse("2020-12-12");
        } catch (ParseException e) {
            e.printStackTrace();
        }

        if (startDate != null && endDate != null){
            Date startDateFlag = startDate;
            while (startDateFlag.compareTo(endDate) <= 0){
                String startDateString = format.format(startDateFlag);
                System.out.println(startDateString);
                c.setTime(startDateFlag);
                // 当前日期加一天
                c.add(Calendar.DATE, 1);
                startDateFlag = c.getTime();
                System.out.println(startDateFlag);
            }
        }
    }