已知两个时间段打印两个时间段中所有月份

最新推荐文章于 2025-04-03 11:46:36 发布

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本文介绍了一个简单的Java程序，用于生成两个指定日期之间的所有月份。通过使用Java 8的LocalDate和DateTimeFormatter，程序能够解析输入的日期范围，并计算出两个日期间的月份数量差异。接着，它会生成并打印出这个范围内每个月的第一天。

public static void main(String[] args) {

String s = "201801 ~ 202001";

String[] split = s.split(" ~ ");

int afterMonth;

int beforeMonth;

int beforeYear;

int afterYear;

int currentYear;

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");

String before = split[0] + "01";
String after = split[1] + "01";

LocalDate beforeLocalDate = LocalDate.parse(before, formatter);

LocalDate afterLocalDate = LocalDate.parse(after, formatter);

beforeMonth = beforeLocalDate.getMonthValue();

afterMonth = afterLocalDate.getMonthValue();

beforeYear = beforeLocalDate.getYear();

afterYear = afterLocalDate.getYear();

int diff = (afterMonth - beforeMonth) + (afterYear - beforeYear) * 12;

currentYear = beforeLocalDate.getYear();
List<String> list = new ArrayList<>();

String date;
if (diff > 0){
    for (int i = 0; i < diff - 1; i++) {
        beforeMonth = beforeMonth + 1;

        if (beforeMonth < 9) {
            date = currentYear + "-" + "0" + beforeMonth;
        } else {
            date = currentYear + "-" + beforeMonth;
        }

        if (beforeMonth % 12 == 0) {
            currentYear++;
            beforeMonth = 0;
        }

        list.add(date);
    }
}

System.err.println(list);

}
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