Can you split a stream into two streams?

Question

I have a data set represented by a Java 8 stream:

Stream stream = ...;

I can see how to filter it to get a random subset - for exa

Answer 1

This was the least bad answer I could come up with.

import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;

public class Test {

    public static  Pair splitStream(Stream inputStream, Predicate predicate,
            Function, L> trueStreamProcessor, Function, R> falseStreamProcessor) {

        Map> partitioned = inputStream.collect(Collectors.partitioningBy(predicate));
        L trueResult = trueStreamProcessor.apply(partitioned.get(Boolean.TRUE).stream());
        R falseResult = falseStreamProcessor.apply(partitioned.get(Boolean.FALSE).stream());

        return new ImmutablePair(trueResult, falseResult);
    }

    public static void main(String[] args) {

        Stream stream = Stream.iterate(0, n -> n + 1).limit(10);

        Pair, String> results = splitStream(stream,
                n -> n > 5,
                s -> s.filter(n -> n % 2 == 0).collect(Collectors.toList()),
                s -> s.map(n -> n.toString()).collect(Collectors.joining("|")));

        System.out.println(results);
    }

}

This takes a stream of integers and splits them at 5. For those greater than 5 it filters only even numbers and puts them in a list. For the rest it joins them with |.

outputs:

 ([6, 8],0|1|2|3|4|5)

Its not ideal as it collects everything into intermediary collections breaking the stream (and has too many arguments!)