@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> subscribeOn(Scheduler scheduler) {
        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new MaybeSubscribeOn<T>(this, scheduler));
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . CUSTOM ) public final Maybe < T > subscribeOn ( Scheduler scheduler ) { ObjectHelper . requireNonNull ( scheduler , "scheduler is null" ) ; return RxJavaPlugins . onAssembly ( new MaybeSubscribeOn < T > ( this , scheduler ) ) ; }
Asynchronously subscribes subscribers to this Maybe on the specified {@link Scheduler}.
<p>
<img width="640" height="752" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Maybe.subscribeOn.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>you specify which {@link Scheduler} this operator will use.</dd>
</dl>

@param scheduler
the {@link Scheduler} to perform subscription actions on
@return the new Maybe instance that its subscriptions happen on the specified {@link Scheduler}
@see <a href="http://reactivex.io/documentation/operators/subscribeon.html">ReactiveX operators documentation: SubscribeOn</a>
@see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
@see #observeOn