src/main/java/io/reactivex/Maybe.java
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
        ObjectHelper.requireNonNull(unit, "unit is null");
        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new MaybeDelay<T>(this, Math.max(0L, delay), unit, scheduler));
    }
@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
        ObjectHelper.requireNonNull(unit, "unit is null");
        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new MaybeDelay<T>(this, Math.max(0L, delay), unit, scheduler));
    }
@ CheckReturnValue @ NonNull @ SchedulerSupport ( SchedulerSupport . CUSTOM ) public final Maybe < T > delay ( long delay , TimeUnit unit , Scheduler scheduler ) { ObjectHelper . requireNonNull ( unit , "unit is null" ) ; ObjectHelper . requireNonNull ( scheduler , "scheduler is null" ) ; return RxJavaPlugins . onAssembly ( new MaybeDelay < T > ( this , Math . max ( 0L , delay ) , unit , scheduler ) ) ; }
Returns a Maybe that signals the events emitted by the source Maybe shifted forward in time by a
specified delay running on the specified Scheduler.
<p>
<img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.s.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>you specify which {@link Scheduler} this operator will use.</dd>
</dl>

@param delay
the delay to shift the source by
@param unit
the time unit of {@code delay}
@param scheduler
the {@link Scheduler} to use for delaying
@return the new Maybe instance
@see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
Returns a Maybe that signals the events emitted by the source Maybe shifted forward in time by a specified delay running on the specified Scheduler . <p > <img width = 640 height = 310 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / delay . s . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > you specify which { @link Scheduler } this operator will use . < / dd > < / dl >