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Core Java - Interview Questions and Answers for 'Lambda expression' - 11 question(s) found - Order By Rating

 Q1. What is arrow function in Typescript ? TypeScript
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   Like         Discuss         Correct / Improve     arraow functions in typescript   lambda expression vs arrow function

 Q2. What are the advantages and disadvantages of Lambda Expression ?Core Java
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 Q3. Have you used Java 8 Lambda expressions ?Core Java
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 Q4. 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 Java
Ans. set1.stream().filter(p->p.element1.equals("Hello")).findAny().isPreent();

or

set1.stream().map(A::getElement1).anyMatch("Hello"::equals)

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 Q5. What is a method reference in Java ?Core Java
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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Rarely asked as it was introduced with Java 8.
 Q6. What is the use of :: operator wef from Java 8 ?Core Java
Ans. We can refer to a function using this operator like System.out.println(intList.stream().reduce(Math::max).get());

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Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q7. What is a Lambda Expression ? What's its use ?Core Java
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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   Like         Discuss         Correct / Improve     java   java8   lambda expression   architecture     Asked in 58 Companies      expert        frequent
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 Q8. Difference between Predicate, Supplier and Consumer ? Core Java
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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 Q9. What does the following lambda expression means ?

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

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Not frequently asked as it was introduced with Java 8.
 Q10. Difference between final and effectively final ? Why is effectively final even required ?Core Java
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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Rarely asked as it was introduced with Java 8.
 Q11. Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?Core Java
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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