Konwersja Stream<int[]> do int[]

import java.util.Arrays;
import java.util.stream.Stream;

public class Main {
    public static void main(String[] args) {
        Stream<Integer[]> s = Stream.of(new Integer[] { 1, 2, 3 }, new Integer[] { 4, 5 });

        Integer[] array = s.flatMap(Arrays::stream).toArray(Integer[]::new);

        Arrays.stream(array).forEach(System.out::println);
    }
}

               Stream.of(new int[]{1,2,3}, new int[]{4,5,6})
                   .flatMapToInt(Arrays::stream)
                   .toArray()