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Core Java - Interview Questions and Answers for 'Collector' - 5 question(s) found - Order By Newest

 Q1. Write a class / program that takes few numbers from the input and then output the average ?Core Java
Ans. public class Class{
   public static void main(String[] args){
      List<Integer> collector = new ArrayList();

      Scanner scanner = new Scanner(System.in);
      int x = scanner.nextInt();
      while(x != 0){
         collector.add(x);
         x = scanner.nextInt();
      }
      System.out.println(collector.stream().collect(Collectors.averagingInt(p->((Integer)p))));
   }
}

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   Like         Discuss         Correct / Improve     coding  code  collector  streams  Collectors.average     Asked in 1 Companies


 Q2. What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getelement2)));
Core Java
Ans. We are averaging elements of a collection by element1 grouped by element1

* list is the reference of collection
* element1 is the member element returned by getElement1 method of ClassA
* element2 is the member element returned by getElement2 method of ClassA

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   Like         Discuss         Correct / Improve     java 8  collections  java 8 streams  collectors


 Q3. Write code to get count of every 5 letter word in a string using lambda expression

Core Java
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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   Like         Discuss         Correct / Improve     Collectors  lambda  filter  coding  java 8


 Q4. Can you explain filter and collectors in java 8 ?Core Java
Ans. Filters are used to filter object in stream on certail criteria. And collector is used to collect outcome of the stream. Collector is a terminal operation.
List numbers = List.of(1,2,3,4,5,6,7);
List evenNumbers = numbers.stream().filter(n -> n%2==0).collect(Collectors.toList());
The above code will filter out odd numbers and return the list of even number.

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   Like         Discuss         Correct / Improve     collector  filter


 Q5. Can you explain filter and collectors in java 8 ?Core Java
Ans. Filters are used to filter object in stream on certain criteria.
Collector is used to collect outcome of the stream. Collector is a terminal operation.
List numbers = List.of(1,2,3,4,5,6,7);
List evenNumbers = numbers.stream().filter(n -> n%2==0).collect(Collectors.toList());
The above code will filter out odd numbers and return the list of even number.

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   Like         Discuss         Correct / Improve     collectors  filters  java 8



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