Elegant way of counting occurrences in a java collection

Now let’s try some Java 8 code:

static public Map<String, Integer> toMap(List<String> lst) {
    return lst.stream()
            .collect(HashMap<String, Integer>::new,
                    (map, str) -> {
                        if (!map.containsKey(str)) {
                            map.put(str, 1);
                        } else {
                            map.put(str, map.get(str) + 1);
                        }
                    },
                    HashMap<String, Integer>::putAll);
}

static public Map<String, Integer> toMap(List<String> lst) {
    return lst.stream().collect(Collectors.groupingBy(s -> s,
                                  Collectors.counting()));
}

I think this code is more elegant.