src/main/java/io/reactivex/Maybe.java
@SuppressWarnings("unchecked")
    @BackpressureSupport(BackpressureKind.FULL)
    @CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Flowable<T> concatArrayDelayError(MaybeSource<? extends T>... sources) {
        if (sources.length == 0) {
            return Flowable.empty();
        } else
        if (sources.length == 1) {
            return RxJavaPlugins.onAssembly(new MaybeToFlowable<T>((MaybeSource<T>)sources[0]));
        }
        return RxJavaPlugins.onAssembly(new MaybeConcatArrayDelayError<T>(sources));
    }
@SuppressWarnings("unchecked")
    @BackpressureSupport(BackpressureKind.FULL)
    @CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Flowable<T> concatArrayDelayError(MaybeSource<? extends T>... sources) {
        if (sources.length == 0) {
            return Flowable.empty();
        } else
        if (sources.length == 1) {
            return RxJavaPlugins.onAssembly(new MaybeToFlowable<T>((MaybeSource<T>)sources[0]));
        }
        return RxJavaPlugins.onAssembly(new MaybeConcatArrayDelayError<T>(sources));
    }
Concatenates a variable number of MaybeSource sources and delays errors from any of them
till all terminate.
<p>
<img width="640" height="425" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Maybe.concatArrayDelayError.png" alt="">
<dl>
<dt><b>Backpressure:</b></dt>
<dd>The operator honors backpressure from downstream.</dd>
<dt><b>Scheduler:</b></dt>
<dd>{@code concatArrayDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@param sources the array of sources
@param <T> the common base value type
@return the new Flowable instance
@throws NullPointerException if sources is null