Principles of Object Oriented Programming
This simple explanation NAILS OOP - Object Oriented Programming Example
What is Object Oriented Programming System OOPS Part 1 | Core Java Tuto...
What is Object Oriented Programming System OOPS Part 2 | Core Java Tuto...
Object Oriented Programming In C# For C And Java Programmers
Guide to key OOP concepts: http://www.codeproject.com/Articles/22769/Introduction-to-Object-Oriented-Programming-Concep
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Java Design Patterns for Interviews is collection of Object oriented design patterns which as an experienced developer you must know before going for a Job Interview.
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Here you can find the description about Object oriented programming and its concepts. Each and every concept is explained individually so read it and comment