305 Talk Summary Template

CSc 305 Talk Summary Template

Student __Anton Snisarenko____________
Email __asnisare@calpoly.edu_________

Topic __Class Relationships, Class Diagrams____

Class Relationships

Dependency

Dependency increases coupling between classes, because more classes are aware of each other
Developers should strive to reduce dependency
Less dependency allows, for easier modification. If class A doesn't know about class B, then
A also is independent of the changes made to B.

Aggregation

Inheritance

UML Class Diagrams

Why ?

Allows to visualize the design
Describes static relationships between classes that are not
easily visible from source code
Easier to discuss and make changes using a diagram, rather
than text descriptions or source code

How ?

Drawing a Class Put only the most important attributes and functions when drawing a class. For "diamond" connectors, the diamond is connected to the object that aggregates another object. For Arrow connectors, the arrow goes to the object from which inheritance happens or on which another object depends The Most commonly used connectors are Aggregation, Inheritance, and Directed Association.	Drawing Connectors
Showing Multiplicity	Multiplicity Types 1 to 1 1 to Many Many to Many
Sample Class Diagram

Give two short exam questions (and solutions) about your topic.

Question #1
Name the 3 commonly used connectors in UML class diagrams
Solution #1
Inheritance, Aggregation, Directed Association
Question #2
Class "Customer" is passed as a paramenter to class "Order". Class "Order" retrieves
an instance of class "Image" from "Customer", which represents the customer's photo.
What kind of relationship exists between "Order" and "Image" ?
Solution #2
Dependency

Helpful resources

Free UML Tools