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Object-Oriented Design (OOD)

Object-Oriented Design (OOD). Aim Design product in terms of objects extracted during OOA If we are using a language without inheritance (C, Ada 83) Use abstract data type design If we are using a language without a type statement (FORTRAN, COBOL) Use data encapsulation.

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Object-Oriented Design (OOD)

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  1. Object-Oriented Design (OOD) • Aim • Design product in terms of objects extracted during OOA • If we are using a language without inheritance (C, Ada 83) • Use abstract data type design • If we are using a language without a type statement (FORTRAN, COBOL) • Use data encapsulation Lecture 16 & 17

  2. Object-Oriented Design Steps • OOD consists of four steps: • 1. Construct interaction diagrams for each scenario • 2. Construct the detailed class diagram • 3. Proceed to the detailed design Lecture 16 & 17

  3. Elevator Problem: OOD • Step 1. Construct interaction diagrams for each scenario • Sequence diagrams • Collaboration diagrams • Both show the same thing • Objects and messages passed between them • But in a different way Lecture 16 & 17

  4. Elevator Problem: OOD (contd) • Normal scenario Lecture 16 & 17

  5. Elevator Problem: OOD (contd) • Sequence diagram Lecture 16 & 17

  6. Collaboration Diagram • Collaboration diagram Lecture 16 & 17

  7. Elevator Problem: OOD (contd) • Step 2. Construct Detailed Class Diagram • Do we assign an action to a class or to a client of that class? • Criteria • Information hiding • Reducing number of copies of action • Responsibility-driven design • Examples close doors is assigned to Elevator Doors move one floor down is assigned to Elevator Lecture 16 & 17

  8. Elevator Problem: OOD (contd) • Detailed class diagram Lecture 16 & 17

  9. Elevator Problem: OOD (contd) • Step 3. Perform detailed design • Detailed design of methodelevator controller loop Lecture 16 & 17

  10. Air Gourmet Case Study: Object-Oriented Design • OOD consists of three steps: • 1. Construct interaction diagrams for each scenario • 2. Construct the detailed class diagram • 3. Proceed to the detailed design Lecture 16 & 17

  11. Step 1. Interaction Diagrams • Extended scenario for making a reservation Lecture 16 & 17

  12. Step 1. Interaction Diagrams (contd) • Sequence diagram for making a reservation Lecture 16 & 17

  13. Step 1. Interaction Diagrams (contd) • Collaboration diagram for sending and returning a postcard Lecture 16 & 17

  14. Step 2. Detailed Class Diagram C++ Version Java Version Lecture 16 & 17

  15. Step 3. Detailed Design • The detailed design can be found in • Appendix H (for implementation in C++) • Appendix I (for implementation in Java) Lecture 16 & 17

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