Write this Code section different

Question

i already posted this , but my post had some mistakes
public class Test {
  public static void main(String... args) {
    System.out.println(merge(new int[] { 1, 3, 4, 4, 4, 4, 4, 5 }, 0));
  }

  public static String merge(int[] ns, int i) {
    if (ns == null || i >= ns.length) {
      return "";
    }

***START HERE with Code "re-writing"***
    int p= 1;
    int n= i;
    do {
      p *= ns[i];
      n++;
    } while (n < ns.length && ns[i] == ns[n]);
    return p+ " " + merge(ns, n);
  }
}

Answer 1

Finally had some time to do it :-)

public static String mergeStreams(int[] ns, int i) {
if (ns == null || i >= ns.length) {
return "";
}

Map<Integer, Integer> intMap = Arrays.stream(ns).skip(i).boxed().collect(Collectors.groupingBy(Integer::intValue,
Collectors.reducing(1, (a, b) -> a * b)));

return intMap.values().stream().map(String::valueOf).collect(Collectors.joining(" "));
}

As for performance, it is much slower this way.

Answer 2

cool, now i understand it :-)
hmmm i will give it a shot in about 2 hours or so. have to watch something now :-D

Answer 3

well this one has mistakes too.
power & next is undefined. :-)

Answer 4

yeah... I am such a noob lol ._. I defined them :)
now it should be at least without mistakes