写一个学生管理系统的代码，用java实现

好的，这是一个简单的学生管理系统代码实现，使用 Java 语言：

import java.util.Scanner;

class Student {
    private String name;
    private int age;
    private int score;

    public Student(String name, int age, int score) {
        this.name = name;
        this.age = age;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }
}

public class StudentManager {
    private static final int MAX_STUDENT_COUNT = 100;
    private static Student[] students = new Student[MAX_STUDENT_COUNT];
    private static int studentCount = 0;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：1. 添加学生  2. 查询学生  3. 退出系统");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent(scanner);
                    break;
                case 2:
                    queryStudent();
                    break;
                case 3:
                    System.exit(0);
                default:
                    System.out.println("输入有误，请重新输入");
            }
        }
    }

    private static void addStudent(Scanner scanner) {
        if (studentCount >= MAX_STUDENT_COUNT) {
            System.out.println("学生人数已达到上限，无法添加");
            return;
        }

        System.out.println("请输入学生姓名：");
        String name = scanner.next();
        System.out.println("请输入学生年龄：");
        int age = scanner.nextInt();
        System.out.println("请输入学生分数：");
        int score = scanner.nextInt();

        Student student = new Student(name, age, score);
        students[studentCount++] = student;

        System.out.println("添加成功");
    }

    private static void queryStudent() {
        System.out.println("姓名\t年龄\t分数");
        for