@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Single<T> observeOn(final Scheduler scheduler) {
    """
	Modifies a Single to emit its item (or notify of its error) on a specified {@link Scheduler},
	asynchronously.
	<p>
	<img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.observeOn.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 notify subscribers on
	@return the source Single modified so that its subscribers are notified on the specified
	{@link Scheduler}
	@throws NullPointerException if scheduler is null
	@see <a href="http://reactivex.io/documentation/operators/observeon.html">ReactiveX operators documentation: ObserveOn</a>
	@see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
	@see #subscribeOn
    """
        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new SingleObserveOn<T>(this, scheduler));
    }
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Single<T> observeOn(final Scheduler scheduler) {
        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new SingleObserveOn<T>(this, scheduler));
    }
@ CheckReturnValue @ NonNull @ SchedulerSupport ( SchedulerSupport . CUSTOM ) public final Single < T > observeOn ( final Scheduler scheduler ) { ObjectHelper . requireNonNull ( scheduler , "scheduler is null" ) ; return RxJavaPlugins . onAssembly ( new SingleObserveOn < T > ( this , scheduler ) ) ; }
Modifies a Single to emit its item (or notify of its error) on a specified {@link Scheduler},
asynchronously.
<p>
<img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.observeOn.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 notify subscribers on
@return the source Single modified so that its subscribers are notified on the specified
{@link Scheduler}
@throws NullPointerException if scheduler is null
@see <a href="http://reactivex.io/documentation/operators/observeon.html">ReactiveX operators documentation: ObserveOn</a>
@see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
@see #subscribeOn
Modifies a Single to emit its item ( or notify of its error ) on a specified { @link Scheduler } asynchronously . <p > <img width = 640 height = 305 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / Single . observeOn . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > you specify which { @link Scheduler } this operator will use . < / dd > < / dl >