Core java - Interview Questions and Answers for 'Dell' | Search Interview Question

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

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Q1. What is a Lambda Expression ? What's its use ?

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. What is the use of constructors in Java ?

Core Java

Ans. Constructors are used to initialize the state of an object. If there are no constructor , objects won't have any initialized state and hence it's elements may contain garbage values. If the memory were used as is, the behavior of the object would also be unpredictable.

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Q3. What is an Interface ?

Core Java

Ans. The interface is a mechanism to achieve abstraction. Interfaces can have abstract methods and variables. It cannot have a method body.

Sample Code for interface

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Q4. Which is the best collections for maintaining elements in an order ?

Core Java

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