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Object Oriented Design Principles

Sayed Ahmed BSc. Engineering in Computer Science and Engineering, BUET, Bangladesh MSc. in Computer Science, University of Manitoba, Canada Owner/Architect/Developer Justetc (Just et cetera) Technologies, Canada http://www.justetc.net http://sayed.justetc.net sayed@justetc.net.

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Object Oriented Design Principles

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  1. Sayed Ahmed BSc. Engineering in Computer Science and Engineering, BUET, Bangladesh MSc. in Computer Science, University of Manitoba, Canada Owner/Architect/Developer Justetc (Just et cetera) Technologies, Canada http://www.justetc.net http://sayed.justetc.net sayed@justetc.net Object Oriented Design Principles

  2. Training and Education in Bangla: • http://Bangla.SaLearningSchool.com • Training and Education in English: • http://www.SaLearningSchool.com • http://English.SaLearningSchool.com • Ask questions and get answers • http://Ask.JustEtc.net • Offline IT Training:  • http://University.JustEtc.net Free Training by justetc

  3. Minimize The Accessibility of Classes and Members • Favor Composition Over Inheritance • Program To An Interface, Not An Implementation • The Open-Closed Principle: • Software Entities Should Be Open For Extension, Yet Closed For Modification Object Oriented Design Principles

  4. The Single Choice Principle: • Whenever a software system must support a set of alternatives, ideally only one class in the system knows the entire set of Alternatives • The Liskov Substitution Principle: • Functions That Use References To Base (Super) Classes Must Be Able To Use Objects Of Derived (Sub) Classes Without Knowing It Object Oriented Design Principles

  5. I will use the following resource to demonstrate the principles • http://userpages.umbc.edu/~tarr/dp/lectures/OOPrinciples.pdf References

  6. http://stackoverflow.com/questions/383947/what-does-it-mean-to-program-to-an-interfacehttp://stackoverflow.com/questions/383947/what-does-it-mean-to-program-to-an-interface • List myList = new ArrayList(); // programming to the List interface instead of • ArrayListmyList = new ArrayList(); // this is bad Program to an interface

  7. Must check • http://www.salearningschool.com/displayArticle.php?table=Articles&articleID=819&title=Object%20Oriented%20Analysis:%20Just%20an%20Overview Object Oriented Analysis

  8. Trudelle Street, Toronto, Ontario, Canada • Shimultuly, Gazipur, Bangladesh • Justetc Computers • Habib Complex, 2nd Floor • Contact us • Sayed: sayed@justetc.net (647-624-8509) • Rafik: rafik@justetc.com (01942747702) Addresses

  9. I provide consulting under Justetc (Just et cetera) Technologies, Canada • I provide consulting on • Software Development • Web Development • Software Engineering • Software and Information Architecture • Mobile Development • Business Analysis • I have several years of professional experience in different areas of IT, Computer Science, and Software & Computer Engineering • My education and experience exposed me to many abstraction levels of computing; from the lowest level to the highest level (electronics, digital system design, computer networks, data communications, databases, software engineering, software development to web development) Our Services

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