JAVA EE: How to generate stream from arrays and collections | Java 8 streams

Tuesday 17 October 2017

How to generate stream from arrays and collections | Java 8 streams | Streams in Java 8

Click here to watch in Youtube :
https://www.youtube.com/watch?v=38sfOINZW0Q&list=UUhwKlOVR041tngjerWxVccw

StreamDemo1.java

import java.util.Arrays;
import java.util.stream.Stream;
/**
 * Generate Streams from Arrays using .stream or Stream.of.
 */
public class StreamDemo1
{
    public static void main(String[] args)
    {
        String[] strArray = { "Apple", "Ball", "Cat", "Dog", "Eagle" };

        // Get Stream using the Arrays.stream
        Stream<String> stream1 = Arrays.stream(strArray);
        stream1.forEach(x -> System.out.println(x));

        System.out.println("---------------------------------");
        
        // Get Stream using the Stream.of
        Stream<String> stream2 = Stream.of(strArray);
        stream2.forEach(x -> System.out.println(x));
    }

}

Output

Apple
Ball
Cat
Dog
Eagle
---------------------------------
Apple
Ball
Cat
Dog
Eagle

StreamDemo2.java

import java.util.ArrayList;
import java.util.List;
/**
 * Generate Streams from Collections.
 */
public class StreamDemo2
{
    public static void main(String[] args)
    {
        List<String> itemList = new ArrayList<>();
        itemList.add("Apple");
        itemList.add("Ball");
        itemList.add("Cat");
        itemList.add("Dog");

        itemList.stream().forEach(item -> System.out.println(item));
    }

}