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Core java - Interview Questions and Answers for 'Elsevier' - 3 question(s) found - Order By Newest

  Q1. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java2017-06-13 08:25:45

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 protection
4. Polymorphism for flexibility and interfacing

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Related Questions

 Can you give a real world example of Encapsulation and Abstraction ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
 Define encapsulation in Java ?
 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. Usually asked along with String Class related questions.
  Q2. What is an immutable class ?Core Java
Anonymous
Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created.

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Related Questions

  Why is String immutable in Java ?
  Why Char array is preferred over String for storing password?
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
 How is string object immutable if we can concat a string to it ?
  What is an Immutable Object ?
  How to implement an immutable class ?
  Does Declaring an object "final" makes it immutable ?
  What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?
  What are advantages of stateless and / or immutable objects ?


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.
  Q3. 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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Related Questions

  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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