Merge two Maps together of type: Map<String, List<String>>

MergeTwoMapofStringListTogether.java

// Merge two Maps together of type: Map<String, List<String>>

static BiFunction<Map<String, List<String>>, Map<String, List<String>>, Map<String, List<String>>> mergeMaps() {
  return (Map<String, List<String>> map1, Map<String, List<String>> map2) -> {
    Map<String, List<String>> mergedMapped = new HashMap<>(map1);
    map2.forEach((String k, List<String> v) -> mergedMapped.merge(k, v, (strings, strings2) -> {
          strings.addAll(strings2);
          return strings;
        })
    );
    return mergedMapped;
  };
}