How to create an RxJava 2 Observable from a Java List

import io.reactivex.Observable;
import java.util.*;

/**
 * Demonstrates how to create an Observable from a List.
 * 
 * Prints:
 *    Hello
 *    world
 * 
 * See https://github.com/ReactiveX/RxJava/wiki/Creating-Observables
 * for more information.
 * 
 */
public class HelloWorld3UsingList {

    public static void main(String[] args) {

        List<String> strings = new ArrayList<String>(
            Arrays.asList("Hello", "world")
        );

        Observable<String> observable = Observable.fromIterable(strings);
        observable.subscribe(s -> System.out.println(s));

    }

}