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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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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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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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Q14. Write a program to print the index of the first non repeated character in a java string

Core 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

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Q17. Design database schema for Facebook like application.

Database

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Q18. How Bitly shortens the URL ?

Web

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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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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

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Q22. Can you name few Java packages which you frequently used ?

Core Java

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Q23. Can you tell something about Web security ?

Web

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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

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Q25. Can you create html and css for a rectangular shape button with width 10px.

CSS

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Q26. What is the difference between Java OR operator and Java script OR operator ?

JavaScript

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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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Q31. How can we align a particular html element to the center using css ?

CSS

Ans. By using attribute align:center

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Q32. What is the doctype declaration at the top of html page ?

Html

Ans. It is an instruction to the web browser about what version of HTML the page is written in, which specifies the rules for the markup language, so that the browsers render the content correctly.

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Q33. In which way are you using dependency injection in Spring ? Annotation , Config or Class ?

Spring

Ans. Possible Answer - We are using config file.

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Q34. How does encoding affect using Reader / writer classes or Stream classes in Java ?

Core Java

Ans. Which group of bytes represent which character is defined by character encoding. So when reading character by character from a stream of bytes using Reader, specifying character encoding becomes significant as the same group of bytes can represent different character in different character encoding(Eg UTF-8 and UTF-16 etc.)

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Q35. How many bytes a character takes with UTF-8 encoding ?

Encoding

Ans. it takes 1 to 4 bytes

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Q36. How executor service is better than using primitive Threading mechanism using Thread class or runnable Interface ?

Core Java

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Q37. Suppose we make an api call using multithreading, How would you design to make sure that we have received response for all threads before exiting the main thread ?

Design

Ans. We can use HashMap for tracking response status for all threads. We can wait every n second by using Thread.sleep and exit the main thread only once we have received response for all threads.

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Q38. Difference between == and === ?

JavaScript

Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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Q39. While working on a web application, you are informed that there is no new data in Database for last few hours ? How would you go about debugging this problem ?

Solution

Ans. Will look into access logs to see if web application is getting any traffic. If not , then will inform the server support team.

Will look into intermediary infrastructure , queues , streams etc to see if there is any choke or throttle there.

If there is any throttle at any point, would make request for either debugging the cause or increasing the infrastructure. For ex - increasing shards in Kinesis.

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Q40. Have you worked on Linux Systems ?

General

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