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Core Java  Interview Questions and Answers for 'Lambda expression'  12 question(s) found  Order By Newest  
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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.  
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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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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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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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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.  
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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.  
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Ans. We can refer to a function using this operator like System.out.println(intList.stream().reduce(Math::max).get());  
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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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Ans. set1.stream().filter(p>p.element1.equals("Hello")).findAny().isPreent(); or set1.stream().map(A::getElement1).anyMatch("Hello"::equals)  
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