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OOPS Interview Questions and Answers | Object Oriented Programming Interview Questions C#



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This 1 hour of video covers most asked Interview questions with answers around OOP Concepts -
00:00 Introduction
02:58 Question 01 :- Why do we need OOP?
06:47 Question 02 :- What are the important pillars in OOP?
09:55 Question 03 :- What is a Class and Object ?
11:01 Question 04 :- Abstraction VS Encapsulation ?
16:28 Question 05 :- Explain Inheritance ?
18:15 Question 06 :- Explain Virtual Keyword ?
18:15 Question 07 :- What is Overriding ?
19:30 Question 08 :- Explain Overloading ?
20:50 Question 09 :- Overloading VS Overriding ?
23:04 Question 10 :- What is Polymorphism ?
23:53 Question 11 :- Can Polymorphism work without Inheritance ?
24:43 Question 12 :- Explain Static VS Dynamic Polymorphism ?
26:32 Question 13 :- Explain Operator Overloading ?
27:18 Question 14 :- How to do Custom Operator Overloading ?
30:16 Question 15 :- Why do we need Abstract Classes ?
34:10 Question 16 :- Are Abstract methods Virtual ?
35:27 Question 17 :- Can we create an instance of Abstract Classes ?
35:27 Question 18 :- Is it compulsory to implement Abstract Methods ?
36:44 Question 19 :- Why simple base class cannot replace Abstract Classes?
38:51 Question 20 :- Explain Interface and Why do we need it ?
40:11 Question 21 :- Can we write logic in Interface ?
40:11 Question 22 :- Can we define methods as private in Interface ?
46:58 Question 23 :- To change Interface what's the best practice ?
47:07 Question 24 :- Explain Multiple Inheritance in Interfaces ?
51:08 Question 25 :- Explain Interface Segregation Principle ?
53:09 Question 26 :- Can we create instance of Interface ?
53:33 Question 27 :- Can we do multiple inheritance of Interface ?

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