@Override
public void removeAttendantFromCourse(int courseId, int studentId) {
Course course = courseDao.getCourse(courseId);
Student student = studentDao.getStudent(studentId);
student.getCourses().remove(course);
studentDao.saveStudent(student);
}
@Override
public void addAttendantToCourse(int courseId, int studentId) {
Course course = courseDao.getCourse(courseId);
Student student = studentDao.getStudent(studentId);
student.getCourses().add(course);
studentDao.saveStudent(student);
}