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Toolkit Part 5

Toolkit Part 5. Toolkit Objectives. Explain how object-oriented analysis can be used to describe an information system Define object modeling terms and concepts, including objects, attributes, methods, messages, classes, and instances

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Toolkit Part 5

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  1. Toolkit Part 5

  2. Toolkit Objectives • Explain how object-oriented analysis can be used to describe an information system • Define object modeling terms and concepts, including objects, attributes, methods, messages, classes, and instances • Explain relationships among objects and the concept of inheritance • Draw an object relationship diagram

  3. Toolkit Objectives • Describe Unified Modeling Language (UML) tools and techniques, including use cases, use case diagrams, class diagrams, sequence diagrams, state transition diagrams, and activity diagrams • Explain the advantages of using CASE tools in developing the object model • Explain how to organize an object model

  4. Introduction • You will learn how to use object-oriented methods to document, analyze, and model an information system • Although traditional structured analysis is the most popular approach, the use of object-oriented analysis and design is growing rapidly

  5. Object-Oriented Terms and Concepts • Object-oriented (O-O) analysis • Object • Object-oriented analysis is a popular approach that sees a system from the viewpoint of the objects themselves as they function and interact • Object model

  6. Object-Oriented Terms and Concepts • Overview of O-O Analysis • Unified Modeling Language (UML) • Attributes • Methods • Message • Class • Instance

  7. Object-Oriented Terms and Concepts • Objects

  8. Object-Oriented Terms and Concepts • Objects

  9. Object-Oriented Terms and Concepts • Objects

  10. Object-Oriented Terms and Concepts • Objects

  11. Object-Oriented Terms and Concepts • Objects

  12. Object-Oriented Terms and Concepts • Objects

  13. Object-Oriented Terms and Concepts • Attributes • If objects are similar to nouns, attributes are similar to adjectives that describe the characteristics of an object • Some objects might have a few attributes; others might have dozens • State

  14. Object-Oriented Terms and Concepts • Methods • Just as objects are similar to nouns and attributes are similar to adjectives, methods resemble verbs that describe what and how an object does something

  15. Object-Oriented Terms and Concepts • Messages • Polymorphism • Black box • Encapsulation • Object-oriented designs typically are implemented with object-oriented programming languages

  16. Object-Oriented Terms and Concepts • Classes

  17. Relationships Among Objects and Classes • Relationships • Relationships describe what objects need to know about each other • Inheritance • Child • Parent

  18. Relationships Among Objects and Classes • Object Relationship Diagram • After you identify the objects, classes, and relationships, you are ready to prepare an object relationship diagram that will provide an overview of the system • You will use that model as a guide as you continue to develop additional diagrams and documentation

  19. Object Modeling with the Unified Modeling Language • The UML uses a set of symbols to represent graphically the various components and relationships within a system • Is mainly used to support object-oriented system analysis and to develop object models

  20. Object Modeling with the Unified Modeling Language • Use Case Modeling • Actor • Uses • Use case description

  21. Object Modeling with the Unified Modeling Language • Use Case Diagrams • Use case diagram • System boundary • After you identify the system boundary, you place the use cases on the diagram, add the actors, and show the relationships

  22. Object Modeling with the Unified Modeling Language • Class Diagrams • Class diagram • Cardinality

  23. Object Modeling with the Unified Modeling Language • Sequence Diagrams • Sequence diagram • Include • Classes • Lifelines • Messages • Focuses

  24. Object Modeling with the Unified Modeling Language • State Transition Diagrams • A state transition diagram shows how an object changes from one state to another, depending on events that affect the object

  25. Object Modeling with the Unified Modeling Language • Activity Diagrams

  26. Object Modeling with the Unified Modeling Language • CASE Tools • Object modeling requires many types of diagrams to represent the proposed system • Creating the diagrams by hand is time- consuming and tedious, so systems analysts rely on CASE tools to speed up the process and provide an overall framework for documenting the system components

  27. Organizing the Object Model • You should organize your use cases and use case diagrams so they can be linked to the appropriate class, state transition, sequence, and activity diagrams • It is much easier to repair a diagram now than to change the software later

  28. Toolkit Summary • This toolkit introduces object modeling, which is a popular technique that describes a system in terms of objects • The Unified Modeling Language (UML) is a widely used method of visualizing and documenting an information system

  29. Toolkit Summary • At the end of the object modeling process, you organize your use cases and use case diagrams and create class, sequence, state transition, and activity diagrams • Toolkit Part 5 complete

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