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Interview Questions and Answers for 'Symantec' - 48 question(s) found - Order By Newest

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  Q1. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java
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 260 Companies      basic        frequent


  Q2. Which are the different segments of memory ?Core Java
Ans. 1. Stack Segment - Contains primitives, Class / Interface names and references.

2. Heap Segment - Contains all created objects in runtime, objects only plus their object attributes (instance variables), Static variables are also stored in heap.

3. Code Segment - The segment where the actual compiled Java bytecodes resides when loaded

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   Like         Discuss         Correct / Improve     java   memory   memory management   stack memory   heap memory   code segment memory   advanced     Asked in 9 Companies      expert        frequent

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Advanced level question usually asked in High end product companies. Have been asked in Google and Amazon (Based on 1 Feedback)
  Q3. Describe, in general, how java's garbage collector works ?Core Java
Ans. The Java runtime environment deletes objects when it determines that they are no longer being used. This process is known as garbage collection. The Java runtime environment supports a garbage collector that periodically frees the memory used by objects that are no longer needed. The Java garbage collector is a mark-sweep garbage collector that scans Java dynamic memory areas for objects, marking those that are referenced. After all possible paths to objects are investigated, those objects that are not marked (i.e. are not referenced) are known to be garbage and are collected.

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   Like         Discuss         Correct / Improve     java   garbage collection   java memory management   advanced     Asked in 21 Companies      intermediate        frequent

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Frequently asked to experienced developers. Recently asked in many US interviews.
  Q4. What is database deadlock ? How can we avoid them?Database
Ans. When multiple external resources are trying to access the DB locks and runs into cyclic wait, it may makes the DB unresponsive.

Deadlock can be avoided using variety of measures, Few listed below -

Can make a queue wherein we can verify and order the request to DB.

Less use of cursors as they lock the tables for long time.

Keeping the transaction smaller.

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   Like         Discuss         Correct / Improve     java   database   architecture     Asked in 7 Companies      expert        frequent


Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM.
  Q5. What is Volatile keyword used for ?Core Java
Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached.

  Sample Code for volatile

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Very frequently asked.Usually among first few questions.
  Q6. What is MVC ? Design
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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Frequently asked to fresh graduates.
  Q7. What is a Deadlock ?Operating System
Ans. When two threads are waiting each other and cant precede the program is said to be deadlock.

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Frequently asked at HCL Technologies ( Based on 3 feedback )
  Q8. Difference between Checked and Unchecked exceptions ?Core Java
Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked.

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Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations.
  Q9. Difference between StringBuffer and StringBuilder ?Core Java
Ans. StringBuffer is synchronized whereas StringBuilder is not.

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 Q10. What is "super" used for ?
Ans. Used to access members of the base class.

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  Q11. How are values passed in Java ? By value or reference ?Core Java
Ans. Java only provides pass by value.

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   Like         Discuss         Correct / Improve     ebay   pass by value   pass by reference   method call   methods   functions   function call     Asked in 10 Companies      basic        frequent


  Q12. What are the types of authentication used in Web services ?Web Service
Ans. Encrypted User Name / Password
Encrypted Password within Cookie
Encrypted Tokens
IP
Client Certificates
Oauth

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   Like         Discuss         Correct / Improve     authentication  security  web service     Asked in 12 Companies      basic        frequent


 Q13. Have you ever heard about csrf attacks ?Security
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 16 Companies


 Q14. Write a program to print the index of the first non repeated character in a java stringCore Java
Ans. public class BuggyBread1{
public static void main (String args[]) {
   String str = "hheello world";
   char[] charArray = str.toCharArray();
   char selectedChar = 'a';
   for(char char1: charArray){
      if(!str.contains(Character.toString(char1).concat(Character.toString(char1)))){
         selectedChar = char1;
         break;
      }
   }
   System.out.println(str.indexOf(Character.toString(selectedChar)));
}
}

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 Q15. What Parameter we need to specify while creating sockets ?
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q16. how is the internal code for the "volatile" implemented ? Core Java
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     volatile     Asked in 1 Companies


 Q17. Design database schema for Facebook like application.Database
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     database design     Asked in 1 Companies      expert


 Q18. How Bitly shortens the URL ?Web
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     web application   url     Asked in 1 Companies        rare


 Q19. Write Java code that would cause deadlock ?Core Java
Ans. https://howtodoinjava.com/java/multi-threading/writing-a-deadlock-and-resolving-in-java/

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   Like         Discuss         Correct / Improve     multithreading  threads  deadlock     Asked in 1 Companies      intermediate


 Q20. How would you design a Thread Pool ?Design
Ans. By using Executor Framework , we can create Thread pool

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 Q21. Suppose you have 8 balls, one of them is either have more/less weight, In how many least possible iterations would you find that ball? Design
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q22. Can you name few Java packages which you frequently used ?Core Java
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q23. Can you tell something about Web security ?Web
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q24. If we have width of an html element as 100px and a border of 10 px. What will be the effective width of the element ? Will the border start after 100 px or after 90 px ?Html
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q25. Can you create html and css for a rectangular shape button with width 10px.CSS
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q26. What is the difference between Java OR operator and Java script OR operator ?JavaScript
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q27. What are the advantages of using cascade style sheets or css ?CSS
Ans. We can enforce consistent UI and can have single point of change for UI components.'

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 Q28. How do you debug Javascript code ?JavaScript
Ans. Possible Answer - I use either Firebug or Chrome Developer tool.

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 Q29. Have you ever worked with Firebug ?Browser
Ans. Possible Answer - Yes, for debugging Javascript issues and fixing CSS and Html.

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 Q30. How can we assign common styling attributes to html tags and how can we do that across different tag types ? CSS
Ans. Using class selector.

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