在Java中如何开发课程管理小系统

public class Course {
    private String courseId;
    private String courseName;
    private String teacher;
    private int credits;
<pre class='brush:java;toolbar:false;'>public Course(String courseId, String courseName, String teacher, int credits) {
    this.courseId = courseId;
    this.courseName = courseName;
    this.teacher = teacher;
    this.credits = credits;
}

// Getter 和 Setter 方法
public String getCourseId() { return courseId; }
public void setCourseId(String courseId) { this.courseId = courseId; }

public String getCourseName() { return courseName; }
public void setCourseName(String courseName) { this.courseName = courseName; }

public String getTeacher() { return teacher; }
public void setTeacher(String teacher) { this.teacher = teacher; }

public int getCredits() { return credits; }
public void setCredits(int credits) { this.credits = credits; }

@Override
public String toString() {
    return "课程编号：" + courseId +
           "，课程名称：" + courseName +
           "，教师：" + teacher +
           "，学分：" + credits;
}

import java.util.ArrayList;
import java.util.Scanner;
<p>public class CourseManager {
private ArrayList<Course> courses = new ArrayList<>();
private Scanner scanner = new Scanner(System.in);</p><pre class='brush:java;toolbar:false;'>// 添加课程
public void addCourse() {
    System.out.print("输入课程编号：");
    String id = scanner.nextLine();
    System.out.print("输入课程名称：");
    String name = scanner.nextLine();
    System.out.print("输入授课老师：");
    String teacher = scanner.nextLine();
    System.out.print("输入学分：");
    int credits = Integer.parseInt(scanner.nextLine());

    Course course = new Course(id, name, teacher, credits);
    courses.add(course);
    System.out.println("课程添加成功！");
}

// 查看所有课程
public void listCourses() {
    if (courses.isEmpty()) {
        System.out.println("暂无课程信息。");
    } else {
        for (Course c : courses) {
            System.out.println(c);
        }
    }
}

// 根据课程编号查找课程
public Course findCourseById(String id) {
    for (Course c : courses) {
        if (c.getCourseId().equals(id)) {
            return c;
        }
    }
    return null;
}

// 删除课程
public void deleteCourse() {
    System.out.print("输入要删除的课程编号：");
    String id = scanner.nextLine();
    Course course = findCourseById(id);
    if (course != null) {
        courses.remove(course);
        System.out.println("课程删除成功！");
    } else {
        System.out.println("未找到该课程！");
    }
}

// 修改课程信息
public void updateCourse() {
    System.out.print("输入要修改的课程编号：");
    String id = scanner.nextLine();
    Course course = findCourseById(id);
    if (course == null) {
        System.out.println("未找到该课程！");
        return;
    }

    System.out.print("输入新的课程名称（原：" + course.getCourseName() + "）：");
    String name = scanner.nextLine();
    System.out.print("输入新的授课老师（原：" + course.getTeacher() + "）：");
    String teacher = scanner.nextLine();
    System.out.print("输入新的学分（原：" + course.getCredits() + "）：");
    int credits = Integer.parseInt(scanner.nextLine());

    course.setCourseName(name);
    course.setTeacher(teacher);
    course.setCredits(credits);
    System.out.println("课程信息更新成功！");
}

// 主菜单
public void showMenu() {
    while (true) {
        System.out.println("\n--- 课程管理系统 ---");
        System.out.println("1. 添加课程");
        System.out.println("2. 查看所有课程");
        System.out.println("3. 删除课程");
        System.out.println("4. 修改课程");
        System.out.println("5. 退出");
        System.out.print("请选择操作：");

        String choice = scanner.nextLine();
        switch (choice) {
            case "1":
                addCourse();
                break;
            case "2":
                listCourses();
                break;
            case "3":
                deleteCourse();
                break;
            case "4":
                updateCourse();
                break;
            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) {
        CourseManager manager = new CourseManager();
        manager.showMenu();
    }
}