Java 8: How to convert List to Map>?

Question

I have a List of String like:

List locations = Arrays.asList(\"US:5423\",\"US:6321\",\"CA:1326\",\"AU:5631\");

And I want to

Answer 1

Try this

Map> locationMap = locations.stream()
            .map(s ->  new AbstractMap.SimpleEntry(s.split(":")[0], s.split(":")[1]))
            .collect(Collectors.groupingBy(Map.Entry::getKey,
                     Collectors.mapping(Map.Entry::getValue, Collectors.toList())));