class CourseDescriptionBuilder {

    protected String getLectureList(List<Identity> lecturers) {
        StringBuilder builder = new StringBuilder();
        boolean firstEntry = true;
        for (Identity lecture : lecturers) {
            if (!firstEntry) {
                builder.append(", ");
            }
            builder.append(lecture.getAttributes().getFirstName());
            builder.append(" ");
            builder.append(lecture.getAttributes().getLastName());
            firstEntry = false;
        }
        return builder.toString();
    }

    public  CourseDescriptionBuilder();

}