Peek method of Java 8 Stream | Java 8 streams tutorial | Java 8 streams | Streams in Java 8

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StreamPeekDemo.java

import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamPeekDemo
{
    public static void main(String[] args)
    {

        /*
         * peek(): This method exists mainly to support debugging,
         * where you want to see the elements as they flow past a
         * certain point in a pipeline
         */
        Stream.of("one", "two", "three", "four")
                .filter(e -> e.length() > 3)
                .peek(e -> System.out.println("Filtered value: " + e))
                .map(String::toUpperCase)
                .peek(e -> System.out.println("Mapped value: " + e))
                .collect(Collectors.toList());

    }
}

Output

Filtered value: three
Mapped value: THREE
Filtered value: four
Mapped value: FOUR

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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/07d37f967453de17efa70af5825dc03ae2d5a7c0/BasicJava/StreamDemo_peek_App/?at=master

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