Interview Questions and Answers for 'Indra' | Search Java Interview Question

Interview Questions and Answers for 'Indra' - 36 question(s) found - Order By Rating

Q1. Have you ever heard about csrf attacks ?

^{2020-01-15 14:26:11}

Ans. Yes, Cross-Site Request Forgery (CSRF) is an attack that forces an end user to execute unwanted actions on a web application in which they're currently authenticated.

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_{Like Discuss Correct / Improve csrf attack Cross-Site Request Forgery (CSRF) Asked in 15 Companies}

Q2. Explain life cycle of Spring Application ?

Spring

^{2019-11-18 14:02:14}

^{This question was recently asked at 'Tech Mahindra'.This question is still unanswered. Can you please provide an answer.}

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Q3. Explain unix commands - cat and pwd.

Unix

^{2019-09-11 08:08:42}

^{This question was recently asked at 'Tech Mahindra'.This question is still unanswered. Can you please provide an answer.}

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Q4. Is there a way to access a private method from an outside class ?

Core Java

^{2019-08-01 14:48:56}

Ans. Through Reflection.

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Q5. what is dispatcher servlet@componentScan use ?

^{2019-05-14 08:05:40}

^{This question was recently asked at 'Tech Mahindra'.This question is still unanswered. Can you please provide an answer.}

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Q6. What is stereotype annotation ?

Spring

^{2019-05-14 08:05:21}

^{This question was recently asked at 'Tech Mahindra'.This question is still unanswered. Can you please provide an answer.}

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Q7. What are the 7 OSI LAYERS ?

Networking

^{2018-11-19 14:21:40}

Ans. Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

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_{Like Discuss Correct / Improve Asked in 7 Companies}

Q8. Why do you want to leave your current job ?

General

^{2018-05-11 07:39:41}

Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career

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_{Like Discuss Correct / Improve Asked in 21 Companies}

Q9. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs

Core Java

^{2017-06-13 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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_{Like Discuss Correct / Improve oops oops features Asked in 237 Companies basic frequent}

Q10. What are the core OOPs concepts ?

Core Java

^{2017-02-06 16:15:55}

Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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_{Like Discuss Correct / Improve core oops concepts Asked in 65 Companies basic frequent}

Q11. What is a Webdriver ?

Testing

^{2017-02-02 08:25:41}

Ans. Selenium WebDriver is a tool for automating web application testing.It helps in replicating the manual tester behavior like keyboard entry, mouse events etc and then matching the output against the expected.

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_{Like Discuss Correct / Improve selenium webdriver Asked in 37 Companies}

Usually asked to entry level software developers.

Q12. Write a program to swap two variables without using third

Core Java

^{2017-01-19 15:38:34}

Ans. public static void main(String[] args) {
   int num1 = 1;
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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_{Like Discuss Correct / Improve code coding Asked in 37 Companies basic frequent}

Q13. What is database Normalization ?

Database

^{2017-01-09 12:00:02}

Ans. https://en.wikipedia.org/wiki/Database_normalization

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_{Like Discuss Correct / Improve normalization database Asked in 35 Companies intermediate frequent}

Q14. What is Maven ?

Maven

^{2016-12-19 10:53:13}

Ans. Maven is a build automation tool used primarily for Java projects.

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_{Like Discuss Correct / Improve maven build Asked in 6 Companies basic frequent}

Basic and Very Frequently asked.

Q15. What is Polymorphism in Java ?

Core Java

^{2016-11-06 09:10:54}

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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_{Like Discuss Correct / Improve polymorphism object oriented programming (oops) oops concepts oops concepts Asked in 107 Companies Basic frequent}

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Frequently asked Design Pattern interview question.

Q16. What is a prototype design pattern ?

Design

^{2016-11-04 08:06:01}

Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects.

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_{Like Discuss Correct / Improve design pattern prototype design pattern cloning Asked in 11 Companies intermediate}

Q17. Explain Exception Hierarchy in Java SE ?

Core Java

^{2016-10-18 11:02:09}

Ans. <a href="http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/" rel="nofollow">http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/</a>

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_{Like Discuss Correct / Improve exception hierarchy exceptions Asked in 3 Companies}

Frequently asked to Fresh graduates.

Q18. Write a program to implement Binary search ?

Core Java

^{2016-10-18 10:49:58}

Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html

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Frequently asked question in companies using Rest Web services.

Q19. Different between POST and PUT in Rest

Rest

^{2016-07-22 14:33:40}

Ans. PUT requests are only meant to place the object as it is on server. For example - You want a file to be uploaded and then placed in a particular folder or you want an Employee object to be persisted in the table.

POST requests are also meant to transfer information from client to server but that information once received at the server is evaluated , modified or refactored before persisting.

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_{Like Discuss Correct / Improve Put vs Post Rest Asked in 5 Companies frequent}

Frequently asked in Indian Service Companies. Tech Mahindra ( Based on 3 inputs ) and Infosys ( 3 inputs )

Q20. What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

Core Java

^Anonymous

Ans. List - Members are stored in sequence in memory and can be accessed through index.
Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates.
Map - Contains Key , Value pairs.

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Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.

Q21. What is a final method ?

Core Java

^Anonymous

Ans. Its a method which cannot be overridden. Compiler throws an error if we try to override a method which has been declared final in the parent class.

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Q22. What is a String Pool ?

Core Java

^Anonymous

Ans. String pool (String intern pool) is a special storage area in Java heap. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference.

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Q23. Explain static blocks in Java ?

Core Java

^Anonymous

Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example:

static {
// whatever code is needed for initialization goes here
}

A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code.

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_{Like Discuss Correct / Improve java oops static static block Asked in 16 Companies basic frequent}

Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.

Q24. Difference between Overloading and Overriding ?

Core Java

^Anonymous

Ans. Overloading - Similar Signature but different definition , like function overloading.

Overriding - Overriding the Definition of base class in the derived class.

Sample Code for overloading

Sample Code for overriding

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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity.

Q25. Explain Flow of Spring MVC ?

Spring

^{Admin
info@buggybread.com}

Ans. The DispatcherServlet configured in web.xml file receives the request.

The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller.

Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet.

The DispatcherServlet determines the view from the ModelAndView object.

Then the DispatcherServlet passes the model object to the View.

The View is rendered and the Dispatcher Servlet sends the output to the Servlet container.

Finally Servlet Container sends the result back to the user.

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Very Frequently asked Spring question.

Q26. What is bean auto wiring?

Spring

^{Admin
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Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using and elements.

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Very frequently asked.Usually among first few questions.

Q27. What is MVC ?

Design

^Anonymous

Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application

1. Controller receives the requests and handles overall control of the request
2. Model holds majority of the Business logic, and
3. View comprise of the view objects and GUI component

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Q28. Write a method to check if input String is Palindrome?

Core Java

^{Admin
info@buggybread.com}

Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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Very frequently asked in HCL Tech ( Based of 4 inputs )

Q29. Write a program to reverse a string iteratively and recursively ?

Core Java

^{Admin
info@buggybread.com}

Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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Very frequently asked Hibernate interview question. Frequently asked in TCS ( based on 2 feedback )

Q30. What are different types of associations in Hibernate ?

Hibernate

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Ans. There are 4 types of associations in Hibernate

One to One
One to Many
Many to One
Many to Many

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