java - 包括本月在内的 future 六个月 list

Question

我可以用这种格式获取当前月份 通过

val dateFormat: SimpleDateFormat = new SimpleDateFormat("YYYYMM")
dateFormat.format(new Date())//201408

但是怎么得到

List(201408,201409,201410,201411,201412,201501)

Answer 1

(Java 语法，但我相信您可以很容易地将其更改为 Scala。)

按优先顺序递减...

使用 Java 8:

// TODO: Which time zone are you interested in?
YearMonth yearMonth = YearMonth.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMM");
List<String> dates = new ArrayList<>();
for (int i = 0; i < 6; i++) {
    dates.add(formatter.format(yearMonth.plusMonths(i)));
}

使用 Joda 时间:

// TODO: Which time zone are you interested in?
YearMonth yearMonth = new YearMonth();
DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyyMM");
List<String> dates = new ArrayList<>();
for (int i = 0; i < 6; i++) {
    dates.add(formatter.print(yearMonth.plusMonths(i)));
}

使用日历:

// TODO: Which time zone are you interested in?
Calendar calendar = Calendar.getInstance();
DateFormat format = new SimpleDateFormat("yyyyMM");
List<String> dates = new ArrayList<>();
for (int i = 0; i < 6; i++) {
    dates.add(format.format(calendar.getTime()));
    calendar.add(Calendar.MONTH, 1);
}