Chapter 1 - Object-Oriented Analysis and Design
Chapter 1 - Object-Oriented Analysis and Design

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Ryerson University
Information Technology Management
ITM 430
Aziz Guergachi

CHAPTER 1 – Object-oriented analysis and design 1.3 What Is Analysis and Design? - Analysis: emphasizes an investigation of the problem and requirements, rather than a solution. o It is broad term, known as requirement analysis or object-oriented analysis - Design: emphasizes a conceptual solution that fulfills the requirements, rather than the implementation o the term is best qualified, as in object-oriented design or database design. - Analysis and design have been summarized in the phase do the right thing (analysis), and do the thing right (design). 1.4 What Is Object-Oriented Analysis and Design? - During object-oriented analysis, there is an emphasis on finding and describing the objects—or concepts—in the problem domain. o Ex. Library information system : Book, Library, Patron - During object-oriented design, there is an emphasis on defining software object and how they collaborate to fulfill the requirements, contains the attributes and methods Ex. Library Object Case: a Book software object may have a title attribute and a getChap-ter method, 1.5 A Short Example - A "dice game" in which a player rolls two dies. If the total is seven, they win; otherwise, they lose. Defining Use Cases - Requirement analysis can be written as use cases and use cases are simply written stories - Example of a Use Case: o Play a Dice Game: Player requests to roll the dice. System presents results: If the dice face value totals seven, player wins; otherwise, player loses. Define a Domain Model: - It is the classification by objects - A decomposition of the domain involves an identification of the concepts, attributes and associations o The result is expressed as a domain model (ITM 500) Define Interaction Diagrams: - A common notation to illustrate these collaborations is the sequence diagram. It shows the flow of messages between software objects, and thus the invocation of methods. Define Design Class Diagrams - it is useful to create a static view of the class definitions with a design class diagram - Since a play message is sent to a DiceGame object, the DiceGame class requires a play method, while class Die requires a roll and getFaceValue method. In contrast to the domain model, this diagram does not illustrate real-world concepts; rather, it shows software classes. 1.6 What is the UML - The Unified Modeling Language (UML) is a language for specifying, visualizing, constructing, and documenting the artifacts of software systems o It is basically pictures and text Three Ways to Apply UML 1) UML as
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