3 import java.util.function.Function;
4 import java.util.stream.Collector;
5 import java.util.stream.Collectors;
9 import java.util.stream.Collector;
13 void p(Map<String, String> m) {
15 .collect(Collector.of(() -> new HashMap<>(),
16 (a, e) -> a.put(e.getValue(), e.getKey()),