如何使用Java来创建简单的学生信息管理系统

public class Student {
    private String id;
    private String name;
    private int age;
    private double score;

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

    // Getter 和 Setter 方法
    public String getId() { return id; }
    public void setId(String id) { this.id = id; }

    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 double getScore() { return score; }
    public void setScore(double score) { this.score = score; }

    @Override
    public String toString() {
        return "学号：" + id + "，姓名：" + name + "，年龄：" + age + "，成绩：" + score;
    }
}

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

public class StudentManager {
    private ArrayList<Student> students = new ArrayList<>();
    private Scanner scanner = new Scanner(System.in);

    // 添加学生
    public void addStudent() {
        System.out.print("输入学号：");
        String id = scanner.nextLine();
        System.out.print("输入姓名：");
        String name = scanner.nextLine();
        System.out.print("输入年龄：");
        int age = Integer.parseInt(scanner.nextLine());
        System.out.print("输入成绩：");
        double score = Double.parseDouble(scanner.nextLine());

        Student student = new Student(id, name, age, score);
        students.add(student);
        System.out.println("添加成功！");
    }

    // 查看所有学生
    public void viewStudents() {
        if (students.isEmpty()) {
            System.out.println("暂无学生信息。");
        } else {
            for (Student s : students) {
                System.out.println(s);
            }
        }
    }

    // 根据学号查找学生
    public Student findStudentById(String id) {
        for (Student s : students) {
            if (s.getId().equals(id)) {
                return s;
            }
        }
        return null;
    }

    // 删除学生
    public void deleteStudent() {
        System.out.print("输入要删除的学号：");
        String id = scanner.nextLine();
        Student student = findStudentById(id);
        if (student != null) {
            students.remove(student);
            System.out.println("删除成功！");
        } else {
            System.out.println("未找到该学生。");
        }
    }

    // 修改学生信息
    public void updateStudent() {
        System.out.print("输入要修改的学号：");
        String id = scanner.nextLine();
        Student student = findStudentById(id);
        if (student != null) {
            System.out.print("新姓名：");
            student.setName(scanner.nextLine());
            System.out.print("新年龄：");
            student.setAge(Integer.parseInt(scanner.nextLine()));
            System.out.print("新成绩：");
            student.setScore(Double.parseDouble(scanner.nextLine()));
            System.out.println("修改成功！");
        } else {
            System.out.println("未找到该学生。");
        }
    }

    // 主菜单
    public void showMenu() {
        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. 查看所有学生");
            System.out.println("3. 删除学生");
            System.out.println("4. 修改学生");
            System.out.println("5. 退出");
            System.out.print("请选择操作：");

            String choice = scanner.nextLine();
            switch (choice) {
                case "1" -> addStudent();
                case "2" -> viewStudents();
                case "3" -> deleteStudent();
                case "4" -> updateStudent();
                case "5" -> {
                    System.out.println("退出系统。");
                    return;
                }
                default -> System.out.println("无效选择，请重试。");
            }
        }
    }
}

public class Main {
    public static void main(String[] args) {
        new StudentManager().showMenu();
    }
}