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Core Java - Interview Questions and Answers for 'Java 8 streams' - 3 question(s) found - Order By Newest

 Q1. How Spliterator in Java 8 different than iterator ?Core Java2016-11-24 09:44:49

Ans. Though there are many differences the way internally they both iterates the collections and streams respectively, but the main difference in performance that is achieved by spliterator as it can iterate Streams in Parallel whereas iterator only iterates collections sequentially.

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   Like         Discuss         Correct / Improve     java8  java 8  spliterator  java 8 streams  streams


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 Q2. What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getelement2)));
Core Java2018-04-10 14:58:24

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


Related Questions

 What will the following code return

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getElement2)));
 Can you explain filter and collectors in java 8 ?
 Can you explain filter and collectors in java 8 ?


 Q3. What will the following code return

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getElement2)));
Core Java2018-04-10 15:00:20

Ans. Map<DataType1,DataType2> where DataType1 is the data type of element1 ( returned by getelement1 method ) and DataType2 is the data type of element2 ( returned by getElement2 method )

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   Like         Discuss         Correct / Improve     java 8  collections  java 8 streams


Related Questions

 What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getelement2)));
 Can you explain filter and collectors in java 8 ?
 Can you explain filter and collectors in java 8 ?



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