Question

Question 3 (1 mark) : Assume that your program has classes Family, House, LivingRoom, Bedroom,Bathroom, Kitchen. What is the most appropriate relationship among the above classes. Write a UML diagram that indicates your system architecture (classes and relationships).

Answer 1

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In this example, We will use multiplicity and composition relationships.

Multiplicity- It is used when cardinality of one class is depicted with respect to another class. For eg- in the above example, one house may have 0 or more families. The notation 0..* depicts zero or many.

Composition- It is used to depict the formation of one class through various other classes. For eg- in this example, the house class is composed of livingRoom , bedRoom, kitchen, bathRoom and bedRoom classes.

In Composition, if the composition class is destroyed, then the sub-classes also gets destroyed. That is, the existence of contained classes (Bedroom, LivingRoom, kitchen, Bathroom) depends on container class(House).  

Compostion is represented directional line connecting the two classes, with a filled diamond shape adjacent to the container class and the directional arrow to the contained class.