java程序

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

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

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

public int getId() {
    return id;
}

public String getName() {
    return name;
}

public int getAge() {
    return age;
}

@Override
public String toString() {
    return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}

}

public class StudentManagementSystem {
private static List students = new ArrayList<>();
private static Scanner scanner = new Scanner(System.in);

public static void main(String[] args) {
    while (true) {
        System.out.println("\n学生信息管理系统");
        System.out.println("1. 添加学生");
        System.out.println("2. 显示所有学生");
        System.out.println("3. 退出");
        int choice = scanner.nextInt();
        scanner.nextLine();

        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                displayStudents();
                break;
            case 3:
                System.out.println("退出系统。");
                return;
            default:
                System.out.println("无效选择，请重新输入。");
        }
    }
}

private static void addStudent() {
    System.out.println("输入学生 ID：");
    int id = scanner.nextInt();
    scanner.nextLine();
    System.out.println("输入学生姓名：");
    String name = scanner.nextLine();
    System.out.println("输入学生年龄：");
    int age = scanner.nextInt();
    scanner.nextLine();
    students.add(new Student(id, name, age));
    System.out.println("学生添加成功！");
}

private static void displayStudents() {
    if (students.isEmpty()) {
        System.out.println("没有学生信息。");
    } else {
        for (Student student : students) {
            System.out.println(student);
        }
    }
}

}