Java中的排序...

你可以自己写Comparator ...

Comparator<LocalDate>

如果你写一个自定义的Comparator<LocalDate>，你可以简单地按LocalDate的 * 子单元 * 或 * 部分 * 排序：
MonthDay，它只保存关于月份和月份的信息，并且已经完全按照需要实现了Comparable<MonthDay>。

代码示例

public static void main(String[] args) {
    // create the list of Strings to be sorted
    List<String> birthdayStrings = List.of(
                "2004-03-05",
                "2001-03-03",
                "2003-12-08",
                "2015-10-08",
                "1999-09-24",
                "1999-07-16",
                "2005-01-28"
            );
    // map this list to a sortable one by parsing the Strings to LocalDates
    List<LocalDate> birthdays = birthdayStrings.stream()
                                               .map(LocalDate::parse)
                                               .collect(Collectors.toList());
    // print the list once
    birthdays.forEach(System.out::println);
    // print some separator in order to visually separate the unsorted from the sorted result
    System.out.println("—".repeat(12));
    // define a comparator for LocalDates that sorts by month-of-year first, then by day-of-month
    Comparator<LocalDate> monthDayComp = new Comparator<LocalDate>() {
        @Override
        public int compare(LocalDate o1, LocalDate o2) {
            // simply sort by (already comparable) part of the LocalDate: MonthDay
            return MonthDay.from(o1).compareTo(MonthDay.from(o2));
        }
    };
    // sort the list using the comparator
    birthdays.sort(monthDayComp);
    // print the sorted list
    birthdays.forEach(System.out::println);
}

输出

2004-03-05
2001-03-03
2003-12-08
2015-10-08
1999-09-24
1999-07-16
2005-01-28
————————————
2005-01-28
2001-03-03
2004-03-05
1999-07-16
1999-09-24
2015-10-08
2003-12-08