Java を使用して簡単な学生の図書貸出ランキング システムを作成するにはどうすればよいですか?

public class Student {
    private int id;
    private String name;
    private String grade;
    private String bookName;
    private Date borrowDate;
    
    // 构造方法
    public Student(int id, String name, String grade, String bookName, Date borrowDate) {
        this.id = id;
        this.name = name;
        this.grade = grade;
        this.bookName = bookName;
        this.borrowDate = borrowDate;
    }
    
    // 省略 getter 和 setter 方法
}

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class RankingSystem {
    private List<Student> students;
    
    public RankingSystem() {
        students = new ArrayList<>();
    }
    
    public void addStudent(Student student) {
        students.add(student);
    }
    
    public void removeStudent(Student student) {
        students.remove(student);
    }
    
    public List<Student> getRankingList() {
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                // 按照借阅日期排序（倒序）
                return s2.getBorrowDate().compareTo(s1.getBorrowDate());
            }
        });
        return students;
    }
}

import java.util.Date;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        // 创建学生图书借阅排行榜系统
        RankingSystem rankingSystem = new RankingSystem();
        
        // 创建学生对象
        Student student1 = new Student(1, "张三", "一年级", "Java入门教程", new Date());
        Student student2 = new Student(2, "李四", "二年级", "数据结构与算法", new Date());
        Student student3 = new Student(3, "王五", "三年级", "计算机网络", new Date());
        
        // 将学生对象添加到学生图书借阅排行榜系统中
        rankingSystem.addStudent(student1);
        rankingSystem.addStudent(student2);
        rankingSystem.addStudent(student3);
        
        // 获取借阅排行榜
        List<Student> rankingList = rankingSystem.getRankingList();
        
        // 输出排行榜中学生的信息
        for (int i = 0; i < rankingList.size(); i++) {
            System.out.println("第" + (i + 1) + "名：" + rankingList.get(i).getName());
        }
    }
}