FizzBuzz with no Conditionals in Java 8 with RxJava

FizzBuzz.java

// Basically a Java copy of https://twitter.com/adereth/status/530740818420957184

import rx.Observable;

import java.util.Arrays;
import java.util.function.Function;

public class FizzBuzz {
    public static void main(String[] args) {
        Function<Integer,String> f = a -> "Fizz";
        Function<Integer,String> b = a -> "Buzz";
        Function<Integer,String> fb = a -> "FizzBuzz";
        Function<Integer,String> s = Object::toString;
        Observable<Function<Integer,String>> fns = Observable.from(Arrays.asList(s, s, f, s, b, f, s, s, f, b, s, f, s, s, fb)).repeat();
        Observable.range(1, 100)
                  .zipWith(fns, (n, fn) -> fn.apply(n)).subscribe(System.out::println);
    }
}

Is RxJava necessary here, I feel this ought to be doable like this using OpenJDK alone.