java 打印指定日期时间段内的每一天

        String dateStart = "2020-02-20";
        String dateEnd = "2020-02-26";

        //第一种
        int monthStart = Integer.parseInt(dateStart.substring(5,7));
        int monthEnd = Integer.parseInt(dateEnd.substring(5,7));
        List<String> dateRange = new ArrayList<>();
        boolean begin = false;
        for (int i = monthStart; i < monthEnd +1; i++) {
    
    
            LocalDate ld = LocalDate.of(2020, i, 1);
            do {
    
    
                if (dateStart.equals(ld.toString()))
                    begin = true;
                if (begin ||  dateEnd.equals(ld.toString())){
    
    
                    dateRange.add(ld.toString());
                }
                if (dateEnd.equals(ld.toString()))
                    break;

                ld = ld.plusDays(1);
            } while (ld.getDayOfMonth() > 1);
        }

        System.out.println(dateRange);
        //第二种
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date startD = sdf.parse(dateStart);
        Date endD   = sdf.parse(dateEnd);
        int gap = (int) ((endD.getTime() - startD.getTime()) / (24*60*60*1000));
//        System.out.println(gap);

        dateRange.clear();
        Calendar cld = Calendar.getInstance();
        cld.setTime(startD);
        for (int i = 0; i < gap +1; i++) {
    
    
            dateRange.add(sdf.format(cld.getTime()));
            cld.add(Calendar.DATE,1);
        }
        System.out.println(dateRange);