Iterables are very useful but provide limited support for lambda expressions. To get other features introduced in Java 8, sometimes there is a need to convert Iterable to Stream in Java.

To convert Iterable to Stream, we first get a Spliterator reference.

We then use StreamSupport class’ stream(Spliterator spliterator, boolean parallel) method to get Stream.

The second argument in this method is for sequential or parallel stream. We need to provide true for parallel stream.

import java.util.Arrays;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
 
public class IterableToStreamExample 
{
    public static void main(String[] args) 
    {
        //creating Iterable
        Iterable<String> iterable = Arrays.asList("a", "b", "c");
         
        //First get Spliterator reference from iterable
        //second argument 'false' is for sequential/parallel stream
        Stream<String> stream = StreamSupport.stream(iterable.spliterator(), false);
         
        //print stream
        stream.forEach(System.out::println);
    }
}

Output

a
b
c