How can i make a relationship in a class diagram one-to one?

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How can I make a relationship in a diagram one-to-one?

How can I make a relationship in a diagram one-to-many?

Do the instructions your about to give me also apply to subclasses and superclasses? If they don't how do I make them apply to superclasses and subclasses?

19 March 2018 17:11:52 Yoseph

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Dusan Rodina - softwareideas.net 19 March 2018 17:35:05

If you have two class elements A and B. You can connect them with composition or aggregation relationship. (The difference between composition and aggregation is described here: www.softwareideas.net/a/210/Class-Diagram--UML- )

For one-to-one relationship set the multiplicity as 1 for both roles (ends).

For one-to-many relationship set the multiplicity as 1 for one role (end) and as * for second role (end). You can edit multiplicities directly in the diagram - select a relationship and then click (or double-click) on the top (left or right) blue rectangle over the relationship line. You can type the custom value for multiplicity or you can just choose it from the drop down list.

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Dusan Rodina - softwareideas.net 19 March 2018 17:37:11

Defined relationships are inherited for subclasses, but not for superclasses.

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