Java中自定义对象数组打印内容而非哈希码的实现

@Override
public String toString() {
    return "id: " + this.id + ", fName: " + this.fName + ", lName: " + this.lName + ", score: " + this.score;
}

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {

    // 学生类定义
    private static class Student {
        String fName;   // 名
        String lName;   // 姓
        int id;         // 学生ID
        int score;      // 分数

        public Student(String fName, String lName, int id, int score) {
            this.fName = fName;
            this.lName = lName;
            this.id = id;
            this.score = score;
        }

        public int getScore() {
            return score;
        }

        // 重写toString()方法，使其打印对象内容而非哈希码
        @Override
        public String toString() {
            return "id: " + this.id + ", fName: " + this.fName + ", lName: " + this.lName + ", score: " + this.score;
        }
    }

    // 检查字符串是否全为字母
    public static boolean isAlphabetic(String str) {
        char[] charArray = str.toCharArray();
        for (char c : charArray) {
            if (!Character.isLetter(c)) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.println("请输入学生数量:");
        int k = input.nextInt(); // 学生数量
        Student[] students = new Student[k];

        for (int i = 0; i < k; ) {
            System.out.println("请输入学生 " + (i + 1) + " 的ID:");
            int id = input.nextInt();

            System.out.println("请输入学生 " + (i + 1) + " 的名:");
            String fName = input.next();
            while (!isAlphabetic(fName)) {
                System.out.println("输入错误！名必须是字母。请重新输入:");
                fName = input.next();
            }

            System.out.println("请输入学生 " + (i + 1) + " 的姓:");
            String lName = input.next();
            while (!isAlphabetic(lName)) {
                System.out.println("输入错误！姓必须是字母。请重新输入:");
                lName = input.next();
            }

            System.out.println("请输入学生 " + (i + 1) + " 的分数:");
            int score = input.nextInt();

            students[i++] = new Student(fName, lName, id, score);
        }

        // 定义按分数排序的比较器
        class ByScoreComparator implements Comparator<Student> {
            @Override
            public int compare(Student s1, Student s2) {
                // 降序排序，所以s2的分数在前
                return Integer.compare(s2.getScore(), s1.getScore());
            }
        }

        // 使用自定义比较器对学生数组进行排序
        Arrays.sort(students, new ByScoreComparator());

        System.out.println("\n排序后的学生信息:");
        // 打印数组，此时会调用Student类的toString()方法
        System.out.println(Arrays.toString(students));

        input.close();
    }
}

排序后的学生信息:
[id: 1, fName: Mo, lName: Nee, score: 900, id: 2, fName: Lee, lName: Jen, score: 600]