Chapter 18

Use Case Realization Implement a Use Case Implement one or more scenarios (Use case is sum of all scenarios)

Fig. 18.1 Use Case Realization

Realization Use case SSD – contain: Systems operations Build communications diagrams or sequence diagrams

Fig. 18.2 Sys Ops in Communication diagrams

Fig. 18.3 Sys Ops in Interaction diagrams

Operational Contracts Fill in details in an interaction diagram Look at enterItem Contract Post condition : sli is created

Fig. 18.4 Apply post condition

Fig. 18.5 Design makeNewSale

Example NextGen Now walk through the design

Fig. 18.6 Create new sale

Fig. 18.7 enterItem Interaction Diagram

Fig. 18.8 Data Class Diagram

Fig. 18.9 How to complete a sale

Fig. 18.10 getTotal

Fig. 18.11 & 18.12

Fig. 18.13 Payment

Fig. 18.14 Alt choice

Fig. 18.15 Log complete sale

Fig. 18.16 get balence

Fig. 18.17 Final DCD

Connect the UI

Fig. 18.18 enterItem

Fig. 18.19 Add getTotal

Fig. 18.20 Sys Start

Fig. 18.28