src/main/java/io/reactivex/Maybe.java
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Maybe<T> fromRunnable(final Runnable run) {
        ObjectHelper.requireNonNull(run, "run is null");
        return RxJavaPlugins.onAssembly(new MaybeFromRunnable<T>(run));
    }
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Maybe<T> fromRunnable(final Runnable run) {
        ObjectHelper.requireNonNull(run, "run is null");
        return RxJavaPlugins.onAssembly(new MaybeFromRunnable<T>(run));
    }
@ CheckReturnValue @ NonNull @ SchedulerSupport ( SchedulerSupport . NONE ) public static < T > Maybe < T > fromRunnable ( final Runnable run ) { ObjectHelper . requireNonNull ( run , "run is null" ) ; return RxJavaPlugins . onAssembly ( new MaybeFromRunnable < T > ( run ) ) ; }
Returns a Maybe instance that runs the given Action for each subscriber and
emits either its exception or simply completes.
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code fromRunnable} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@param <T> the target type
@param run the runnable to run for each subscriber
@return the new Maybe instance
@throws NullPointerException if run is null
Returns a Maybe instance that runs the given Action for each subscriber and emits either its exception or simply completes . <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > {