How to map values in a map in Java 8? [duplicate]

Question

Say I have a Map<String, Integer>. Is there an easy way to get a Map<String, String> from it?

By easy, I mean not like this:

Map<String, String> mapped = new HashMap<>(); for(String key : originalMap.keySet()) {     mapped.put(key, originalMap.get(key).toString()); } 

But rather some one liner like:

Map<String, String> mapped = originalMap.mapValues(v -> v.toString()); 

But obviously there is no method mapValues.

Answer 1

You need to stream the entries and collect them in a new map:

Map<String, String> result = map.entrySet()     .stream()     .collect(Collectors.toMap(Entry::getKey, e -> String.valueOf(e.getValue()));