Core Java - Interview Questions and Answers for 'Lambda' | Search Java Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Interview Questions


 2679 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text

   



Core Java - Interview Questions and Answers for 'Lambda' - 20 question(s) found - Order By Newest

  Q1. What is a Lambda Expression ? What's its use ?Core Java
Admin
info@buggybread.com
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

 Help us improve. Please let us know the company, where you were asked this question :   


   Like      Discuss      Correct / Improve     java   java8   lambda expression   architecture     Axxess  CACI  ZonOff  Dell India  Wellington Management  N26  Lithium Technologies  DST Systems  Overstock  Sofi      expert        frequent
Try 1 Question(s) Test

Not frequently asked as it was introduced with Java 8.
 Q2. Difference between final and effectively final ? Why is effectively final even required ?Core Java
Admin
info@buggybread.com
Ans. Final variable means a variable that has been declared final and hence cannot be de referenced after initialization. Effective final means a variable that has not been declared final but haven't been reassigned the value after initialization.

First is the regulation that restricts the reassignment and will raise a compilation error if we try to do so. Second is the outcome without the restriction.

Effective Final is the eventual treatment of the variable that is required for many features. For eq - Java 8 requires that local variables referenced from a lambda expression must be final or effectively final.It means all local referenced from lambda expressions must be such that their value shouldn't be changed after initialization whether declared final or not.

 Help us improve. Please let us know the company, where you were asked this question :   


   Like      Discuss      Correct / Improve     java   java8   java 8   final   effective final   final vs effective final   lambda expressions      expert
Try 2 Question(s) Test

 Q3. Difference between Predicate, Supplier and Consumer ? Core Java
Admin
info@buggybread.com
Ans. Predicate represents an anonymous function that accepts one argument and produces a result.

Supplier represents an anonymous function that accepts no argument and produces a result.

Consumer represents an anonymous function that accepts an argument and produces no result.

  Sample Code for Predicate

  Sample Code for Supplier

  Sample Code for Consumer

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   java8   predicate   consumer   supplier   lambda expression      expert

 Q4. Write a Program that gets a set of numbers , filters out the non prime numbers , calculate the factorial of each prime number and then finds the average of all factorials using Lambda expressions2017-05-14 14:02:57

Ans. public class BuggyBread1 {
   
   public static void main(String args[]) {
      
      // Declare and Initialize the Collection
      Set<Integer> intSet = new HashSet<Integer>();

      // Add Elements
      intSet.add(1);
      intSet.add(2);
      intSet.add(3);
      intSet.add(4);
      intSet.add(5);

      double averageOfNonPrimeFactorials = intSet.stream().filter(p->checkIfPrime(p)).collect(Collectors.averagingInt(p->calculateFactorial(p)));
      
      System.out.println(averageOfNonPrimeFactorials );
   }
   
   static private boolean checkIfPrime(int num){
      for(int count=2;count < num;count++){
         if(num % count == 0){
            return false;
         }
      }
      return true;
   }
   
   static private int calculateFactorial(int num){
      int factorial = 1;
      for(int count=num;count > 0;count--){
         factorial = factorial * count;
      }
      return factorial;
   }
}

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java 8  lambda expressions  lambda  filter  Collectors  factorial  prime number

 Q5. What does the following lambda expression means ?

helloJava8 ( x-> x%2 )
Admin
info@buggybread.com
Ans. helloJava8 receives an Integer as argument and then returns the modulus of that Integer.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   java8   lambda expression

Rarely asked as it was introduced with Java 8.
 Q6. Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?Core Java
Admin
info@buggybread.com
Ans. They all does the same task i.e to compute statistical information on the stream of data. They differ by the way they store the statistical information as they expect a different data type of the values being used.

IntSummaryStatistics and LongSummaryStatistics expect non floating point values and hence stores the statistical information like min,max and sum as non floating values ( int or long ) whereas DoubleSummaryStatistics stores these information as floating value.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   java8   java 8   lambda expressions   doublesummarystatistics   intsummarystatistics   longsummarystatistics   summarystatistics

Rarely asked as it was introduced with Java 8.
 Q7. What is the use of :: operator wef from Java 8 ?Core Java2016-07-25 13:27:57

Ans. We can refer to a function using this operator like System.out.println(intList.stream().reduce(Math::max).get());

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     :: operator   lambda expression  java 8

 Q8. What is a method reference in Java ?Core Java2017-01-29 13:55:22

Ans. Introduced with java 8 , Method References help us to point to methods by their name.

A method references is described using :: symbol

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     method reference  java 8  lambda expressions

 Q9. What is Lambda Calculus ?Core Java2017-05-29 09:55:22

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     lambda calculus


Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here


 Q10. Lets say we have a set "set1" with objects of Class A, Class has a non static string called element1, Write a code ( using lambda expression ) to see if there is any object in the set with element1 = "Hello". Core Java2017-08-06 11:51:10

Ans. set1.stream().filter(p->p.element1.equals("Hello")).findAny().isPreent();

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     lambda expressions  java 8  java8  java 8 filter  findAny()

 Q11. Given a collection of Employee objects, how can we get the customers with name starting with 'A' using lambda expression.Core Java2017-08-17 11:01:46

Ans. List emp = Arrays.asList("American", "Indian", "Finn");
emp.stream().filter(em -> em.startsWith("A")).forEach(System.out.println);

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java8  java 8  lambda     Sofi

 Q12. Tell me something about Amazon Lambda.AWS2018-01-11 11:18:18

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     amazon lambda  aws  aws lambda

 Q13. What are the problems one could face while working with serverless technologies like AWS Lambda ?AWS2018-01-30 18:05:47

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     serverless technologies  aws lambda

 Q14. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.AWS2018-01-30 18:06:37

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     aws api gateway  aws lambda

 Q15. What are the benefits of using AWS Lambda over EC2 ?AWS2018-01-30 18:07:57

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     AWS  AWS Lambda  AWS EC2

 Q16. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?AWS2018-01-30 18:08:28

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     aws  aws lambda  aws ec2

 Q17. How to know IP of the machine where lambda function runs ?Amazon Web Service2018-04-12 09:57:17

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     AWS Lambda

 Q18. How to assign a static or IP range to Lambda Function ?Amazon Web Service2018-04-12 09:58:10

 This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     AWS  AWS Lambda

 Q19. Write code to get count of every 5 letter word in a string using lambda expression

Core Java2018-04-18 13:06:13

Ans. String str = "I had been saying that he had been there";

Map<String,Long> countWords = Arrays.asList(str.split(" ")).stream().filter(p->p.length() = 5).collect(Collectors.groupingBy(p->p,Collectors.counting()));

System.out.println(countWords);

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     Collectors  lambda  filter  coding  java 8


Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here


 Q20. Have you used Java 8 Lambda expressions ?Core Java2018-06-30 13:24:52

 This question was recently asked at 'One Click Retail'.This question is still unanswered. Can you please provide an answer.


 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java 8  lambda expressions     One Click Retail        frequent


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner


comments powered by Disqus
 

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked:
         

X Close this

X Close this

Help Us Improve.
Please share your
interview experience.

Company Name:   


Questions Asked: