Method create

src/main/java/io/reactivex/rxjava3/core/Maybe.java:866–872

Provides an API (via a cold Maybe) that bridges the reactive world with the callback-style world. Example: Maybe.<Event>create(emitter ->

(@NonNull MaybeOnSubscribe<T> onSubscribe)

     * @see Cancellable
     */
    @CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <@NonNull T> Maybe<T> create(@NonNull MaybeOnSubscribe<T> onSubscribe) {
        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
        return RxJavaPlugins.onAssembly(new MaybeCreate<>(onSubscribe));
    }

    /**
     * Calls a {@link Supplier} for each individual {@link MaybeObserver} to return the actual {@link MaybeSource} source to