帮我写java学生信息管理系统

好的，我可以给您提供一个简单的 Java 学生信息管理系统的代码框架，您可以根据您的需求进行修改和完善。以下是代码：

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

public class StudentManagementSystem {
    private static ArrayList<Student> studentList = new ArrayList<>();

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

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1.添加学生信息");
            System.out.println("2.删除学生信息");
            System.out.println("3.修改学生信息");
            System.out.println("4.查询学生信息");
            System.out.println("5.退出系统");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent(scanner);
                    break;
                case 2:
                    deleteStudent(scanner);
                    break;
                case 3:
                    updateStudent(scanner);
                    break;
                case 4:
                    queryStudent(scanner);
                    break;
                case 5:
                    System.out.println("感谢使用学生信息管理系统，再见！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("请输入正确的操作序号！");
                    break;
            }
        }
    }

    private static void addStudent(Scanner scanner) {
        System.out.println("请输入学生姓名：");
        String name = scanner.next();
        System.out.println("请输入学生学号：");
        String id = scanner.next();
        System.out.println("请输入学生性别：");
        String gender = scanner.next();
        System.out.println("请输入学生年龄：");
        int age = scanner.nextInt();
        Student student = new Student(name, id, gender, age);
        studentList.add(student);
        System.out.println("添加学生信息成功！");
    }

    private static void deleteStudent(Scanner scanner) {
        System.out.println("请输入要删除的学生学号：");
        String id = scanner.next();
        boolean isDelete = false;

        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getId().equals(id)) {
                studentList.remove(i);
                isDelete = true;
                break;
            }
        }

        if (isDelete) {
            System.out.println("删除学生信息成功！");
        } else {
            System.out.println("未找到该学生信息！");
        }
    }

    private static void updateStudent(Scanner scanner) {
        System.out.println("请输入要修改的学生学号：");
        String id = scanner.next();
        boolean isUpdate = false;

        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getId().equals(id)) {
                System.out.println("请输入学生姓名：");
                String name = scanner.next();
                System.out.println("请输入学生性别：");
                String gender = scanner.next();
                System.out.println("请输入学生年龄：");
                int age = scanner.nextInt();
                Student student = new Student(name, id, gender, age);
                studentList.set(i, student);
                isUpdate = true;
                break;
            }
        }

        if (isUpdate) {
            System.out.println("修改学生信息成功！");
        } else {
            System.out.println("未找到该学生信息！");
        }
    }

    private static void queryStudent(Scanner scanner) {
        System.out.println("请输入要查询的学生学号：");
        String id = scanner.next();
        boolean isQuery = false;

        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getId().equals(id)) {
                System.out.println(studentList.get(i));
                isQuery = true;
                break;
            }
        }

        if (!isQuery) {
            System.out.println("未找到该学生信息！");
        }
    }
}

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

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

    @Override
    public String toString() {
        return "学生姓名：" + name + "\n学生学号：" + id + "\n学生性别：" + gender + "\n学生年龄：" + age;
    }

    public String getId() {
        return id;
    }
}

该系统包括了添加、删除、修改和查询学生信息的功能，您可以根据需要进行修改和完善。