Generic Exam: Object-Oriented Analysis and Design

Time: 2.5 hours

Marking: 100 marks, plus 10 marks for the bonus question.

Purpose

This purpose of this generic exam is to allow you to see what the real final exam will look like, and the relative weighting in terms of marks. The only significant difference between this generic exam and the final one is that the latter will include a specific case study.

Exam Process

This examination is composed of multiple sections. Each subsequent section relies upon standard solutions from the previous sections. You are required to submit your section answers—on completion—to the examination coordinator, and trade it for the standard solution. Use the provided standard solution as the basis for your subsequent work.

On completion of the examination, hand in the entire set of standard solutions.

Do not reveal or discuss the standard solutions, either during or after the examination.

Marking

▪ Please note that the use case questions have the least marks, since they are relatively straightforward and not an object-oriented skill. In contrast, the questions on responsibility assignment, patterns, and design of collaborations have the most marks, since these are the most important object-oriented design skills.

Evaluation Objectives

▪ Ability to identify primary use cases and record them in expanded, essential form.

▪ Ability to identify outstanding concepts, associations, and attributes and record them in a conceptual model using the UML notation.

▪ Ability to identify system events and record them in a system sequence diagram using the UML notation.

▪ Ability to assign responsibilities and design collaborations between software components using the GRASP patterns, and illustrate the results in UML collaboration diagrams.

▪ Ability to summarize class definitions in a UML design class diagram.

▪ Ability to map design artifacts into class definitions in an object-oriented programming language.

Evaluation: Use Cases

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1. (5 marks) Identify at least 4 primary use cases and related actors. Draw the results in a UML use case diagram.

2. (10 marks) Write the use case in expanded, essential, conversational style. Include both a typical course of events, and an alternatives section. In the alternatives section, list exactly two frequent alternatives. Do not write an elaborate heading section for the use case (i.e., ignore Purpose, Overview, …); rather, start immediately with the typical course of events. On completion, hand this section in and trade it for the standard use case solution.

Evaluation: Conceptual Modeling

3. (20 marks) Bounded by the use case, create a conceptual model and illustrate it in UML notation. Show concepts, associations, and attributes.

Evaluation: System Events

4. (5 marks) Bounded by the use case, create a system sequence diagram in the UML notation. Show actors and system events.

Evaluation: Responsibility Assignment and Collaboration Design

5. (25 marks) Using the operation contract as a starting hint, complete the UML collaboration diagram. Annotate every message with the GRASP (Expert, Creator, and so on) and/or other pattern that justifies it.

6. (25 marks) Using the operation contract as a starting hint, complete the UML collaboration diagram. Annotate every message with the GRASP (Expert, Creator, and so on) and/or other pattern that justifies it.

Evaluation: Design Class Diagrams

7. (5 marks) Draw a partial design class diagram, only for the and classes. Show all attributes, associations (with navigability), and method signatures.

Evaluation: Mapping Designs to Code

8. (5 marks) Based on the provided design class diagrams and collaboration diagrams, show the class definition for class . Show all instance variable (data member) definitions, but only show the complete method (member function) body definition for one method: . Ignore fine details of syntax—the objective is to evaluate your basic ability to map from designs to code. Use the object-oriented programming language indicated by the examination coordinator.

Evaluation: Motivation

Optional Bonus Question

(this exact question will be on the exam)

9. (10 marks)

a. (6 marks) In the approach to “analysis” and “design” that has been studied in this course, briefly compare and contrast these two terms. What is “analysis” about? What is “design” about?
b. (4 marks) Briefly, what are some motivations for creating 1) conceptual models, and 2) operation contracts?