src/main/java/io/reactivex/Completable.java
@SchedulerSupport(SchedulerSupport.NONE)
    public final Disposable subscribe() {
        EmptyCompletableObserver observer = new EmptyCompletableObserver();
        subscribe(observer);
        return observer;
    }
@SchedulerSupport(SchedulerSupport.NONE)
    public final Disposable subscribe() {
        EmptyCompletableObserver observer = new EmptyCompletableObserver();
        subscribe(observer);
        return observer;
    }
@ SchedulerSupport ( SchedulerSupport . NONE ) public final Disposable subscribe ( ) { EmptyCompletableObserver observer = new EmptyCompletableObserver ( ) ; subscribe ( observer ) ; return observer ; }
Subscribes to this CompletableConsumable and returns a Disposable which can be used to dispose
the subscription.
<p>
<img width="640" height="352" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.subscribe.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@return the Disposable that allows disposing the subscription
Subscribes to this CompletableConsumable and returns a Disposable which can be used to dispose the subscription . <p > <img width = 640 height = 352 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / Completable . subscribe . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > {