CODEWITHSUNDEEP
javaumldiagramclass-diagram
tingtong
tingtong

Reputation: 67

UML Class Diagram - Multiple Associations

an UML class diagram that pictures an high school administration system is required.

[Draft of Elements]

further, it is asked to design the following:

a) which Teacher, teaches which Class, in which Subject, for how many hours/week?
b) is there a safe way to assure that a Teacher only teaches Subjects he has a Certificate for?

after fuzzing around several hours i came up with this: [Complete Draft].

but i still can not imagine how to design the diagram in a way that all (or at least three) of the conditions from a) are presented as required.

is there actually a way to do so in a UML class diagram?

edit: after reading Ayo Ks comment i came up with this: img

Upvotes: 0

Views: 3199

Answers (2)

granier
granier

Reputation: 1789

I would use an association class with a constraint.

enter image description here

Upvotes: 1

Ayo K
Ayo K

Reputation: 1774

which Teacher, teaches which Class, in which Subject, for how many hours/week?

This means that what binds the teacher to a class is a Subject. Since there are multiple subjects, a teacher will have a property that represents a list of subject, and a class will also have a list of subjects. For representing how many hours/week, this will be tied to the subject. A subject should have a property representing how many hours it should last and a property representing how many times a week it is taught. This way once a teacher teaches a subject, by getting the subject the teacher takes, you can pick out how many times a week and how may hours

b) is there a safe way to assure that a Teacher only teaches Subjects he has a Certificate for?

For this since a certification is tied to a subject, things will change a bit. This will mean that a Teacher will no longer have a List of subjects as a property but rather a list of certifications, so by getting the certifications a teacher has, you can get the subject(s) the teacher can take from the certifications and the number of hours/week the teacher takes the subject

Hope this helps you in finishing your diagram.

Upvotes: 1

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