public int typeLessonComparator(Lesson l1, Lesson l2)
{
if (l1.getSubject().getSubjectType().getPriority() > l2.getSubject().getSubjectType().getPriority())
{
return(1);
}
else if (l1.getSubject().getSubjectType().getPriority() < l2.getSubject().getSubjectType().getPriority())
{
return(-1);
}
else
{
return(0);
}
}
internal bool isDifferent(Lesson lesson)
{
return(!this.subject.Equals(lesson.getSubject()));
}