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Object Oriented Design

Object Oriented Design. Programming Concepts. Introduction . OO-Design is not Magic Important concepts that OO-Programming simplifies: Code Reusability Abstraction Layered Design Scalability. Code Reusability. OO-Design simplifies Code Reusability.

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Object Oriented Design

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  1. Object Oriented Design Programming Concepts

  2. Introduction • OO-Design is not Magic • Important concepts that OO-Programming simplifies: • Code Reusability • Abstraction • Layered Design • Scalability

  3. Code Reusability • OO-Design simplifies Code Reusability. • We can create a closed object and use it for other applications. • Saving time and money for future applications in design and debugging.

  4. Code Reusability (Example) • Class with specific values • Quick and easy to program. • Code not Reusable. • Build a generic class instead (configurable) • Adds overhead Bounds Checking, Parsing etc. • Takes more time to program. • Code is Reusable.

  5. Abstraction • A very useful tool, OO languages make this possible. • Different classes can be given a common interface. • The objects created look the same to the outside world. • Calling applications need not know the details.

  6. Abstraction (Example) • Connecting two Clients together • LAN, WAN, serial, parallel etc. • A communication class for each of the methods could be created. • The application using these objects would not have to know the difference. • The appropriate class is chosen.

  7. Layered Design • OO-Programming makes Layering very easy. • Objects become the building blocks. • Objects are broken down into closely related functions. • Each layer only accesses the layers directly below it. • This simplifies the application and enables multiple persons to program it.

  8. Layered Design (Example) • A simple communications program. • It is broken down into layers. • If I want to change a lower layer I can without effecting higher layers.

  9. Scalability • An important concept is Scalability and OO-Programming helps simplify this. • Scalability leads to lower costs since changes are easy to implement. • By breaking functions/data into objects, they can be reused to form a scalable solution to a problem. • When you think about an application you need to look at how well we can make it scale or expand.

  10. Scalability (Example) • Basic View, lacks Scalability. • If we need to upgrade, the changes are large. • Big Picture = Scalable • We now have all the hooks to do any size network.

  11. Conclusion • In OO-Design it is important to think about • Reusability • Abstraction • Layered Design • Scalability • These Design practices in the long run will save time and money.

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