用Java代码写一个学生选课管理系统

好的，我可以为您提供一个学生选课管理系统的Java代码框架，您可以根据自己的需要进行修改和完善。

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

public class Course {
    private String name;
    private String teacher;
    private int credit;
    private int capacity;
    private int enrolled;

    public Course(String name, String teacher, int credit, int capacity) {
        this.name = name;
        this.teacher = teacher;
        this.credit = credit;
        this.capacity = capacity;
        enrolled = 0;
    }

    public String getName() {
        return name;
    }

    public String getTeacher() {
        return teacher;
    }

    public int getCredit() {
        return credit;
    }

    public int getCapacity() {
        return capacity;
    }

    public int getEnrolled() {
        return enrolled;
    }

    public void setEnrolled(int enrolled) {
        this.enrolled = enrolled;
    }
}

public class Student {
    private String name;
    private ArrayList<Course> courses;

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

    public String getName() {
        return name;
    }

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

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

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

    public int getTotalCredit() {
        int totalCredit = 0;
        for (Course course : courses) {
            totalCredit += course.getCredit();
        }
        return totalCredit;
    }
}

public class CourseManagementSystem {
    private ArrayList<Course> courses;
    private ArrayList<Student> students;

    public CourseManagementSystem() {
        courses = new ArrayList<>();
        students = new ArrayList<>();
    }

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

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

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

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(Student student) {
        students.remove(student);
    }

    public ArrayList<Student> getStudents() {
        return students;
    }

    public void enroll(Student student, Course course) {
        if (course.getEnrolled() < course.getCapacity()) {
            student.addCourse(course);
            course.setEnrolled(course.getEnrolled() + 1);
        } else {
            System.out.println("Sorry, the course is full.");
        }
    }

    public void withdraw(Student student, Course course) {
        student.removeCourse(course);
        course.setEnrolled(course.getEnrolled() - 1);
    }
}

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

        Course c1 = new Course("Java Programming", "John Smith", 3, 30);
        Course c2 = new Course("Database Management", "Mary Johnson", 3, 25);
        Course c3 = new Course("Web Development", "Bob Brown", 4, 35);

        cms.addCourse(c1);
        cms.addCourse(c2);
        cms.addCourse(c3);

        Student s1 = new Student("Tom");
        Student s2 = new Student("Jerry");

        cms.addStudent(s1);
        cms.addStudent(s2);

        cms.enroll(s1, c1);
        cms.enroll(s1, c2);
        cms.enroll(s2, c1);
        cms.enroll(s2, c3);

        System.out.println("Courses:");
        for (Course course : cms.getCourses()) {
            System.out.println(course.getName() + " - " + course.getTeacher() + " - " + course.getEnrolled() + "/" + course.getCapacity());
        }

        System.out.println();

        System.out.println("Students:");
        for (Student student : cms.getStudents()) {
            System.out.println(student.getName() + " - Total Credit: " + student.getTotalCredit());
            System.out.println("Enrolled Courses:");
            for (Course course : student.getCourses()) {
                System.out.println(course.getName() + " - " + course.getTeacher() + " - " + course.getCredit());
            }
            System.out.println();
        }

        cms.withdraw(s1, c1);

        System.out.println("Courses:");
        for (Course course : cms.getCourses()) {
            System.out.println(course.getName() + " - " + course.getTeacher() + " - " + course.getEnrolled() + "/" + course.getCapacity());
        }

        System.out.println();

        System.out.println("Students:");
        for (Student student : cms.getStudents()) {
            System.out.println(student.getName() + " - Total Credit: " + student.getTotalCredit());
            System.out.println("Enrolled Courses:");
            for (Course course : student.getCourses()) {
                System.out.println(course.getName() + " - " + course.getTeacher() + " - " + course.getCredit());
            }
            System.out.println();
        }
    }
}

这段代码实现了一个简单的学生选课管理系统，包括课程和学生两个类，以及一个管理系统类。您可以根据自己的需求进行修改和完善。