java实验学生选课系统

选课系统的实现可以分为以下几个步骤：

1. 定义学生和课程类

public class Student {
    private String name;
    private int id;
    private List<Course> courses;

    // 构造函数、getter和setter方法
}

public class Course {
    private String name;
    private int id;
    private int credit;
    private int capacity;
    private List<Student> students;

    // 构造函数、getter和setter方法
}

2. 实现选课和退课功能

public class CourseSelectionSystem {
    private List<Student> students;
    private List<Course> courses;

    public void selectCourse(Student student, Course course) {
        if (course.getCapacity() > 0) {
            course.getStudents().add(student);
            student.getCourses().add(course);
            course.setCapacity(course.getCapacity() - 1);
        } else {
            System.out.println("选课失败，课程已满！");
        }
    }

    public void dropCourse(Student student, Course course) {
        course.getStudents().remove(student);
        student.getCourses().remove(course);
        course.setCapacity(course.getCapacity() + 1);
    }

    // 其他方法
}

3. 编写测试类

public class TestCourseSelectionSystem {
    public static void main(String[] args) {
        Course math = new Course("高等数学", 1, 3, 2);
        Course english = new Course("英语", 2, 2, 1);

        Student alice = new Student("Alice", 1);
        Student bob = new Student("Bob", 2);

        CourseSelectionSystem system = new CourseSelectionSystem();
        system.selectCourse(alice, math);
        system.selectCourse(bob, math);
        system.selectCourse(bob, english);
        system.dropCourse(alice, math);
    }
}

以上是一个简单的选课系统的实现，可以根据需求进行扩展。