Add some OOP questions (#67)

* added some oop questions * Update oop.md
7 years ago · d522c4cceb
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@ -2,3 +2,7 @@ Object-Oriented Programming
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 - How would you design a chess game? What classes and objects would you use? What methods would they have?
+- How would you design the data structures for a book keeping system for a library?
+- Explain how you would design a HTTP server? Give examples of classes, methods, and interfaces. What are the challenges here?
+- Discuss algorithms and data structures for a garbage collector?
+- How would you implement an HR system to keep track of employee salaries and benefits?