1. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 1 The Movement Toward Objects Chapter 16 (part 2)

2. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 2 UML (Unified Modelling Lang.) Defines a set of nine object diagramming techniques The key building block is the use case Diagrams are tightly integrated syntactically and conceptually to represent an integrated whole Application of UML can vary among organisations

3. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 3 Use Case Diagram (reminder)

4. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 4 Sequence Diagram

5. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 5 Sequence Diagram Concepts Illustrates the classes that participate in a use case Shows the messages that pass between classes over time for one use case Can be a generic sequence diagram, but more frequently one is drawn for a single scenario within the use case Design diagrams are implementation specific -- database objects or specific GUI components serve as classes

6. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 6 Sequence Diagram

7. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 7 Steps in Creating a Sequence Diagram 1. Identify classes 2. Add messages 3. Place lifeline and focus of control

8. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 8 Syntax for Sequence Diagram

9. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 9 Class Diagram

10. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 10 Class Diagram Concepts A static model that shows the classes and relationships among classes that remain constant in the system over time Resembles the ERD, but depicts classes which include both behaviours and states, while entities in the ERD include only attributes Scope not system wide, but pertaining to a single use case

11. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 11 Steps in Creating a Class Diagram 1. Identify classes 2. Identify attributes and operations 3. Draw relationships between classes

12. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 12 Class Diagram for Manage Appointment

13. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 13 Class Diagram Syntax

14. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 14 Method Types Constructor methods create new instances of a class Query methods determine the state of an object and make information about that state available to the system Update methods will change the value of some or all of the object’s attributes, resulting in a change of state

15. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 15 Multiplicity

16. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 16 Association Class

17. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 17 Aggregation and Generalisation Associations

18. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 18 Statechart Diagram

19. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 19 Statechart Concepts A dynamic model showing changes of state of a single class over time in response to events along with its responses and actions Typically not used for all classes, but just to help simplify the design of algorithms for methods of complex classes

20. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 20 Steps for Creating a Statechart Diagram 1. Identify the states 2. Identify the transitions

21. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 21 Syntax for Statechart Diagram

22. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 22 Statechart Diagram for a Hospital Patient

23. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 23 The Life of an Order

24. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 24 Statechart Diagram for an Order

25. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 25 Summary Many organisations are moving to the use of object-oriented techniques Objects are grouped into classes that share common properties and methods and arranged in a hierarchy Objects communicate by sending messages which trigger methods

26. PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design Copyright 2000 © John Wiley & Sons, Inc. All rights reserved. Slide 26 Summary Major object-oriented modelling techniques include: Use case diagrams Sequence diagrams Class diagrams Statechart diagrams