By Dan Clark (auth.)
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Extra info for An Introduction to Object-Oriented Programming with Visual Basic .NET
On the left side of the Properties Editor, click the Create a Use Case Diagram button. J. :J ~ ~ 8iJ 13 I§ 0 lt1l B3 10 ~ l(g1 ~ ~ ... , _j --, ""l -<>- 'I' Figure 2-5. Properties Editor 3. You will be presented with a design surface in the main editor window. Along the left side of the window are shapes used in creating use case diagrams. Click the Create an Actor button (see Figure 2-6) . Draw the Actor shape on the design surface. Change the name of the Actor shape to Member. 24 Designing OOP Solutions: Identifying the Class Structure ~~Iii l I.
When branching occurs in a sequence diagram, the diagram is actually modeling different scenarios of the same use case. Including different scenarios in the same sequence diagram can become confusing. It is often a much better idea to model each scenario with its own separate sequence diagram. 49 Chapter3 ACTIVITY 3-1. CREATING A SEQUENCE DIAGRAM After completing this activity you should be familiar with the following: • Producing a sequence diagram to model object interaction • Using UML Modeler to create a sequence diagram • Adding methods to the class diagram Examining the Scenario The following scenario was created for a use case in the user group library application introduced in Activity 2-1.
View Flight Info «USeS» Reserve Seat Customer Figure 2-3. Reserve Seat use case diagram The following text further describes the use case diagram shown in Figure 2-3: • Preconditions: The customer has looked up the flight information. The customer has logged in and is viewing the flight booking screen. 19 Chapter2 • Description: The customer enters the flight number and indicates the seats being requested. After the customer submits the request, some confirmation information is displayed. • Postconditions: The customer is sent a confirmation email outlining the flight details and the cancellation policy.