Method subscribeWith

src/main/java/io/reactivex/rxjava3/core/Maybe.java:5445–5451

Subscribes a given MaybeObserver (subclass) to this Maybe and returns the given MaybeObserver as is. Usage example: Maybe<Integer> source = Maybe.just(1); CompositeDisposable composite = new CompositeDisposable(); DisposableMaybeObserver<Integer> d

(E observer)

     * @throws NullPointerException if {@code observer} is {@code null}
     */
    @CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    @NonNull
    public final <@NonNull E extends MaybeObserver<? super T>> E subscribeWith(E observer) {
        subscribe(observer);
        return observer;
    }

    /**
     * Returns a {@code Maybe} that emits the items emitted by the current {@code Maybe} or the items of an alternate