Monday 21 August 2017

Java 8 parallel Stream example | Java 8 streams tutorial | Java 8 streams | Streams in Java 8


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StreamDemo.java
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;

/**
 * 
 * To enable parallelism, all you have to do is to create a parallel
 * stream, instead of sequential stream. And to surprise you, this is
 * really very easy.
 * 
 * Anytime you want to particular job using multiple threads in
 * parallel cores, all you have to call method parallelStream() method
 * instead of stream() method.
 *
 */
public class StreamDemo
{
    public static void main(String[] args)
    {
        List<Integer> numberList = new ArrayList<Integer>();
        
        for (int i = 1; i < 20; i++)
        {
            numberList.add(i);
        }
        
        // Here creating a parallel stream
        Stream<Integer> parallelStream = numberList.parallelStream();
        Integer[] evenNumbersArray = parallelStream.filter(i -> i % 2 == 0)
                                                   .toArray(Integer[]::new);
        
        for (Integer evenNumber : evenNumbersArray)
        {
            System.out.println(evenNumber);
        }
    }
}
Output
2
4
6
8
10
12
14
16
18

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_parallel_array_filter_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_parallel_array_filter_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/bc0205890e206d66c03b068b168e05c78f68f50d/BasicJava/StreamDemo_parallel_array_filter_App/?at=master

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