Java8: HashMap to HashMap using Stream / Map-Reduce / Collector

Question

I know how to \"transform\" a simple Java List from Y -> Z, i.e.:

List x;
List y = x.stre         


        

Answer 1

My StreamEx library which enhances standard stream API provides an EntryStream class which suits better for transforming maps:

Map output = EntryStream.of(input).mapValues(Integer::valueOf).toMap();