How does combiner in Stream.collect method work in java 8?

Question

I created simple demo :

public static void main(String[] args) {
        List list2 = Arrays.asList(\"adf\", \"bcd\", \"abc\", \"hgr\", \"jyt\"         


        

Answer 1

I think that the combiner is only used in parallel Streams (to combine the partial outputs of the parallel computations), so make your Stream parallel.

String collect = list2.parallelStream().collect(...