JAVA EE: How to do Stream concatenation in Java 8 Stream

Monday 28 August 2017

Click here to watch in Youtube :
https://www.youtube.com/watch?v=jMyyr-4FK5w&list=UUhwKlOVR041tngjerWxVccw

StreamConcatDemo.java

import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;

public class StreamConcatDemo
{
    public static void main(String[] args)
    {
        List<Integer> list1 = Arrays.asList(1, 2, 3);
        List<Integer> list2 = Arrays.asList(4, 5, 6);

        /*
         * It creates a lazily concatenated stream including all the
         * elements of first stream and followed by next stream.
         */
        Stream<Integer> concatenatedStream = Stream.concat(list1.stream(),list2.stream());
        concatenatedStream.forEach(s -> System.out.print(s + " "));
    }
}