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Q1. Explain OOPs

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Explain OOPs Principles

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Explain OOPs Concepts

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Explain OOPs features

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Tell me something about OOPs

Core Java

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Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protected
4. Polymorphism for flexibility and interfacing

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Can you give a real world example of Encapsulation and Abstraction ?

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a. Inheritance
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d. Composition

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Give an example of how Object Oriented Programming Concepts can be implemented.

Which of the OOP's features facilitate dependency injection ?

Which of the OOP's feature - encapsulation or abstraction - is more important ?

Which of the polymorphism type - static or runtime - is more important ?

Which of the OOP's feature is most important ?

Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.

Q2. What is rule regarding overriding equals and hashCode method ?

Core Java

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Ans. A Class must override the hashCode method if its overriding the equals method.

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Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

Write a class and override the equals and hashcode method ?

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