学生选课管理系统java数据结构代码

学生选课管理系统是一个常见的项目，它可以使用Java语言和数据结构来实现。下面是一个简单的示例代码，用于演示学生选课管理系统的基本功能：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class Course {
    private String courseId;
    private String courseName;

    public Course(String courseId, String courseName) {
        this.courseId = courseId;
        this.courseName = courseName;
    }

    public String getCourseId() {
        return courseId;
    }

    public String getCourseName() {
        return courseName;
    }
}

class Student {
    private String studentId;
    private String studentName;
    private List<Course> courses;

    public Student(String studentId, String studentName) {
        this.studentId = studentId;
        this.studentName = studentName;
        this.courses = new ArrayList<>();
    }

    public String getStudentId() {
        return studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public List<Course> getCourses() {
        return courses;
    }

    public void addCourse(Course course) {
        courses.add(course);
    }

    public void removeCourse(Course course) {
        courses.remove(course);
    }
}

class CourseManagementSystem {
    private Map<String, Course> courseMap;
    private Map<String, Student> studentMap;

    public CourseManagementSystem() {
        this.courseMap = new HashMap<>();
        this.studentMap = new HashMap<>();
    }

    public void addCourse(String courseId, String courseName) {
        Course course = new Course(courseId, courseName);
        courseMap.put(courseId, course);
    }

    public void addStudent(String studentId, String studentName) {
        Student student = new Student(studentId, studentName);
        studentMap.put(studentId, student);
    }

    public void enrollCourse(String studentId, String courseId) {
        if (studentMap.containsKey(studentId) && courseMap.containsKey(courseId)) {
            Student student = studentMap.get(studentId);
            Course course = courseMap.get(courseId);
            student.addCourse(course);
        }
    }

    public void dropCourse(String studentId, String courseId) {
        if (studentMap.containsKey(studentId) && courseMap.containsKey(courseId)) {
            Student student = studentMap.get(studentId);
            Course course = courseMap.get(courseId);
            student.removeCourse(course);
        }
    }

    public List<Course> getStudentCourses(String studentId) {
        if (studentMap.containsKey(studentId)) {
            Student student = studentMap.get(studentId);
            return student.getCourses();
        }
        return new ArrayList<>();
    }
}

public class Main {
    public static void main(String[] args) {
        CourseManagementSystem cms = new CourseManagementSystem();

        // 添加课程
        cms.addCourse("C001", "Java Programming");
        cms.addCourse("C002", "Data Structures");
        cms.addCourse("C003", "Database Management");

        // 添加学生
        cms.addStudent("S001", "Alice");
        cms.addStudent("S002", "Bob");

        // 学生选课
        cms.enrollCourse("S001", "C001");
        cms.enrollCourse("S001", "C002");
        cms.enrollCourse("S002", "C002");
        cms.enrollCourse("S002", "C003");

        // 获取学生选课信息
        List<Course> aliceCourses = cms.getStudentCourses("S001");
        List<Course> bobCourses = cms.getStudentCourses("S002");

        System.out.println("Alice's courses:");
        for (Course course : aliceCourses) {
            System.out.println(course.getCourseId() + " - " + course.getCourseName());
        }

        System.out.println("Bob's courses:");
        for (Course course : bobCourses) {
            System.out.println(course.getCourseId() + " - " + course.getCourseName());
        }
    }
}

这段代码实现了一个简单的学生选课管理系统，包括添加课程、添加学生、学生选课、退课以及获取学生选课信息等功能。你可以根据自己的需求进行扩展和修改。