public CourseDate(CourseDate cd)
{
this.courseID = cd.getCourseID();
this.startTime = cd.getStartTime();
this.endTime = cd.getEndTime();
this.CDSList = null;
}
public CourseDateStudent(CourseDate cd, int sid)
{
this.courseID = cd.getCourseID();
this.startTime = cd.getStartTime();
this.endTime = cd.getEndTime();
this.studentID = sid;
this.present = false;
this.tardy = false;
this.unexcusedAbsence = false;
}