用java代码写一个学生选课管理系统

好的，我可以给你提供一个学生选课管理系统的Java代码框架，你可以在此基础上进行修改和完善。以下是代码：

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

public class StudentCourseManagementSystem {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Student> studentList = new ArrayList<>();
        List<Course> courseList = new ArrayList<>();

        // 初始化课程信息
        // 例如：courseList.add(new Course(1, "Java程序设计", 3));
        // ...

        while (true) {
            System.out.println("----------------------------");
            System.out.println("欢迎进入学生选课管理系统，请输入对应数字进行操作：");
            System.out.println("1. 学生注册");
            System.out.println("2. 学生登录");
            System.out.println("3. 查看课程列表");
            System.out.println("4. 学生选课");
            System.out.println("5. 学生退课");
            System.out.println("6. 查看已选课程");
            System.out.println("7. 退出系统");
            System.out.println("----------------------------");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    // 学生注册
                    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("请输入学生性别：");
                    String gender = scanner.next();
                    System.out.println("请输入学生学号：");
                    String id = scanner.next();
                    System.out.println("请输入学生密码：");
                    String password = scanner.next();
                    Student student = new Student(name, age, gender, id, password);
                    studentList.add(student);
                    System.out.println("注册成功！");
                    break;
                case 2:
                    // 学生登录
                    System.out.println("请输入学生学号：");
                    String loginId = scanner.next();
                    System.out.println("请输入学生密码：");
                    String loginPassword = scanner.next();
                    boolean loginSuccess = false;
                    for (Student s : studentList) {
                        if (s.getId().equals(loginId) && s.getPassword().equals(loginPassword)) {
                            System.out.println("登录成功！");
                            loginSuccess = true;
                            break;
                        }
                    }
                    if (!loginSuccess) {
                        System.out.println("登录失败，请检查学号或密码！");
                    }
                    break;
                case 3:
                    // 查看课程列表
                    System.out.println("课程列表如下：");
                    for (Course c : courseList) {
                        System.out.println(c.getId() + " " + c.getName() + " " + c.getCredit());
                    }
                    break;
                case 4:
                    // 学生选课
                    System.out.println("请输入要选课的学生学号：");
                    String selectId = scanner.next();
                    System.out.println("请输入要选的课程编号：");
                    int selectCourseId = scanner.nextInt();
                    boolean selectSuccess = false;
                    // 选课操作
                    // ...
                    break;
                case 5:
                    // 学生退课
                    System.out.println("请输入要退课的学生学号：");
                    String dropId = scanner.next();
                    System.out.println("请输入要退的课程编号：");
                    int dropCourseId = scanner.nextInt();
                    boolean dropSuccess = false;
                    // 退课操作
                    // ...
                    break;
                case 6:
                    // 查看已选课程
                    System.out.println("请输入要查看的学生学号：");
                    String viewId = scanner.next();
                    // 查看已选课程操作
                    // ...
                    break;
                case 7:
                    // 退出系统
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }
}

class Student {
    private String name;
    private int age;
    private String gender;
    private String id;
    private String password;
    private List<Course> selectedCourses;

    public Student(String name, int age, String gender, String id, String password) {
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.id = id;
        this.password = password;
        selectedCourses = new ArrayList<>();
    }

    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 String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public List<Course> getSelectedCourses() {
        return selectedCourses;
    }

    public void setSelectedCourses(List<Course> selectedCourses) {
        this.selectedCourses = selectedCourses;
    }

    public void addSelectedCourse(Course course) {
        selectedCourses.add(course);
    }

    public void removeSelectedCourse(Course course) {
        selectedCourses.remove(course);
    }
}

class Course {
    private int id;
    private String name;
    private int credit;

    public Course(int id, String name, int credit) {
        this.id = id;
        this.name = name;
        this.credit = credit;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getCredit() {
        return credit;
    }

    public void setCredit(int credit) {
        this.credit = credit;
    }
}

这段代码提供了一个基本的学生选课管理系统框架，包含学生注册、登录、查看课程列表、选课、退课、查看已选课程等功能。你可以在此基础上进行改进和完善。