Slides Part 2 (OOA, pages 1-128, pdf, 4 slides per page)
Slides Part 2 (OOA, pages 1-128, pdf, 4 slides per page)
Slides Part 2 (OOA, pages 1-128, pdf, 4 slides per page)
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MEANING OF THE CLASS DIAGRAM<br />
➠ Each institute has exactly one professor who leads it.<br />
➠ This professor is called ”director”.<br />
➠ A professor leads at most one institute.<br />
➠ A professor can give course, but need not do so.<br />
➠ Each course is given by at most two professors (also zero professors are<br />
possible).<br />
➠ A student takes four to six courses.<br />
➠ There, he is a “participant”.<br />
➠ A course has to be taken by at least three students.<br />
ROLE NAMES<br />
➠ are written at the ends of the links<br />
➠ <strong>per</strong> convention, role names are written in small letters<br />
Person<br />
1..*<br />
child<br />
17<br />
IsChildOf<br />
19<br />
parent<br />
2<br />
ASSOCIATIONS WITH ARITY GREATER THAN TWO<br />
Associations can exist between more than two classes.<br />
MULTIPLICITIES<br />
Student Exam<br />
Room<br />
Writes<br />
➠ express cardinality constraints of relations<br />
18<br />
➠ for each object o of Class2, there exist m objects o ′ of Class1, such that o<br />
and o ′ are in relation Rel.<br />
Notation:<br />
Class1<br />
Rel<br />
Class2<br />
m<br />
• number n: exactly n objects<br />
• scope i..j<br />
• * : any number, also 0<br />
• i..∗ : at least i<br />
• ∗..j : at most j<br />
• not specified : means *<br />
• 0..1, 3..4, 6..∗ :<br />
20<br />
all quantities except 2 and 5
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