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Core java - Interview Questions and Answers for 'Collabera' - 4 question(s) found - Order By Newest

Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q1. What is a Lambda Expression ? What's its use ?Core Java
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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Basic and Very Frequently asked.
  Q2. What is Polymorphism in Java ?Core Java
Ans. Polymorphism means the condition of occurring in several different forms.

Polymorphism in Java is achieved in two manners

1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas

2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

  Sample Code for overloading

  Sample Code for overriding

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  Q3. What is the use of HashCode in objects ?Core Java
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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  Q4. What are the core OOPs concepts ?Core Java
Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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