Using streams, how can I map the values in a HashMap?

Question

Given a Map where Person has a String getName() (etc) method on it, how can I turn the Map

Answer 1

One way is to use a toMap collector:

import static java.util.stream.Collectors.toMap;

Map byNameMap = people.entrySet().stream()
                                     .collect(toMap(Entry::getKey, 
                                                    e -> e.getValue().getName()));