Java 身份证排序算法：按日期升序排列

import java.util.*;

public class IDSort { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = Integer.parseInt(scanner.nextLine()); String[] ids = new String[n]; for (int i = 0; i < n; i++) { ids[i] = scanner.nextLine(); }

    String command;
    while (!(command = scanner.nextLine()).equals("e")) {
        if (command.equals("sort1")) {
            sort1(ids);
        } else if (command.equals("sort2")) {
            sort2(ids);
        } else {
            System.out.println("exit");
            return;
        }
    }
}

public static void sort1(String[] ids) {
    List<String> dates = new ArrayList<>();
    for (String id : ids) {
        String date = id.substring(6, 14);
        String formattedDate = date.substring(0, 4) + '-' + date.substring(4, 6) + '-' + date.substring(6);
        dates.add(formattedDate);
    }
    Collections.sort(dates);
    for (String date : dates) {
        System.out.println(date);
    }
}

public static void sort2(String[] ids) {
    Arrays.sort(ids, new Comparator<String>() {
        @Override
        public int compare(String id1, String id2) {
            String date1 = id1.substring(6, 14);
            String date2 = id2.substring(6, 14);
            return date1.compareTo(date2);
        }
    });
    for (String id : ids) {
        System.out.println(id);
    }
}

}