TAILIEUCHUNG - Lecture Software engineering: Lecture 7 - Ivan Marsic

Lecture 7: Object oriented design. The main contents of this chapter include all of the following: Assigning responsibilities to objects, design principles (Expert doer, high cohesion, low coupling), business policies, class diagram. | Ivan Marsic Rutgers University LECTURE 7: Object Oriented Design Topics Assigning Responsibilities to Objects Design Principles Expert Doer High Cohesion Low Coupling Business Policies Class Diagram select function(“unlock") : System User «initiating actor» prompt for the key enter key verify key signal: valid key, lock open open the lock, turn on the light Timer «offstage actor» start ("duration“) System Sequence Diagrams considered interactions between the actors We already worked with interaction diagrams: System Sequence Diagrams System Sequence Diagrams Design: Object Interactions System Sequence Diagrams considered interactions between the actors Object Sequence Diagrams consider interactions between the objects System Sequence Diagram Design Sequence Diagram Metaphor for Software Design: “Connecting the Dots” We start with objects/concepts from the Domain Model and modify or introduce new objects, as needed to make the system function work. .

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