Learning RxJava

Creating a Flowable

Earlier in this book, we used Observable.create() a handful of times to create our own Observable from scratch, which describes how to emit items when it is subscribed to, as shown in the following code snippet:

import io.reactivex.Observable;import io.reactivex.schedulers.Schedulers;public class Launcher {    public static void main(String[] args) {        Observable<Integer> source = Observable.create(emitter -> {             for (int i=0; i<=1000; i++) {                 if (emitter.isDisposed())                     return;                emitter.onNext(i);             }            emitter.onComplete();         });        source.observeOn(Schedulers.io())                 .subscribe(System.out::println);        sleep(1000);     } }

The output is as follows:

 0 1 2 3 4 ...

This Observable.create()will emit the integers 0 to 1000 and then call onComplete() ...