public interface CourseI {

  /**
   * Get the course Id.
   */
  public String getId();

  /**
   * Get the course name.
   */
  public String getName();

  /**
   * Get the current class size. Initially,
   * this will be zero, but grow as students
   * sign up.
   */
  public int getClassSize();

  /**
   * This is the maximum number of students
   * that can be in the course.
   */
  public int getMaxClassSize();

  /**
   * This is how many credit hours the
   * course provides.
   */
  public int getCreditHours();
}