import io.reactivex.rxjava3.core.BackpressureStrategy;

import io.reactivex.rxjava3.core.Flowable;

import io.reactivex.rxjava3.schedulers.Schedulers;

​

public class FlowableCreation {

​

    public static void main(String[] args) throws InterruptedException {

        Flowable.create(emitter -> {

        for(int i = 0; i <= 5000; i++ ) {

            if(emitter.isCancelled())

                return;

            emitter.onNext(i);

        }

        emitter.onComplete();

        }, BackpressureStrategy.BUFFER)

        .observeOn(Schedulers.io())

        .subscribe(System.out::println);

        Thread.sleep(2000);

    }

​

}

​