Design - Interview Questions and Answers for 'Virtusa' | Search Interview Question

Design - Interview Questions and Answers for 'Virtusa' - 3 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.

Q1. Differences between abstract class and interface ?

Core Java

Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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What are the different uses of Interfaces in Java ?

Why can't we have diamond problem with interfaces ?

Why do we need Thread class even in case we execute thread using runnable interface ?

What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

What are Marker Interfaces ? Name few Java marker interfaces ?

Can we declare interface methods as private ?

What is comparator interface used for ?

What is the use of runnable interface if we can always create a new thread using Thread class ?

Which of the following doesn't extend Collection interface ?

Frequently asked in face to face interviews.

Q2. Write a program to print fibonacci series.

Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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What are the steps to be performed while coding Junit with Mocking framework ?

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Have you ever encoded the response before sending it back from the service? If Yes , Which encoding was used ?

What are the different type of encoding you have used ?

How does encoding affect using Reader / writer classes or Stream classes in Java ?

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Does spaces get's encoded in html encoding ?

Q3. What is the use of load-on-startup ?

Design

Ans. The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet.You can pass positive and negative value for the servlet.

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