CODEWITHSUNDEEP
inheritanceuml
SgtDroelf
SgtDroelf

Reputation: 351

subclass consists of various elements of its superclass

i am currently trying to design a uml class diagramm for a simple application i'm developing. The Problem: I have a class, that is a subclass and another subclass of the same superclass. The first one, lets call it subclass1 consists of various elements of the superclass, that is itself and the other subclass2.

Now i'm not sure how to model this correctly in UML. The following two pictures show the two possibilities i've come up with. Both don't seem correct tbh.

Option1

Option 1: subclass1 is an aggregation of it's superclass.

Option2

Option 2: subclass2 contains a list of superclass elements

My Question: Is one of these correct and if not, how would i model it correctly?

Upvotes: 1

Views: 181

Answers (1)

qwerty_so
qwerty_so

Reputation: 36295

Basically both diagrams are the same. You are using a shared aggregation in the first where you intend to express multiplicity. This is not correct. Shared aggregation has an open semantic to be defined in the context of a domain.

enter image description here

The picture above would be the preferred way. It uses an association with multiplicity and a role name. This is semantically identical to your second picture.

N.B. I used upper case for the class names as this is a common convention.

Upvotes: 1

Related Questions