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Core Java - Interview Questions and Answers for 'Lambda' - 22 question(s) found - Order By Newest

  Q1. What is a Lambda Expression ? What's its use ?Core Java
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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

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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
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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.

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 Q3. Difference between Predicate, Supplier and Consumer ? Core Java
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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

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 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;
   }
}

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 Q5. What does the following lambda expression means ?

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

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Rarely asked as it was introduced with Java 8.
 Q6. Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?Core Java
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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.

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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());

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 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

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

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 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();

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 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);

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

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

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 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

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

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

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

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

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 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);

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

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 Q21. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?Amazon Web Services (AWS)2018-10-26 11:34:47

Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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 Q22. How can we schedule Lambda function to run daily ?Amazon Web Services ( AWS )2018-10-26 11:41:04

Ans. We can schedule that through CloudWatch.

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