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

  Q1. What is a Lambda Expression ? What's its use ?Core Java
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Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

  Sample Code for lambda

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  Q2. 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 protected
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 ?
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 Which of the polymorphism type - static or runtime - is more important ?
 Which of the OOP's feature is most important ?


 Q3. What is a ConcurrentHashMap ?Core Java
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Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap.

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 isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?
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