Java 8 の Stream API を使用して、リスト内の単語の頻度を効率的にカウントするにはどうすればよいでしょうか?

<code class="java">List<String> wordsList = Lists.newArrayList("hello", "bye", "ciao", "bye", "ciao");</code>

<code class="java">{ciao=2, hello=1, bye=2}</code>

<code class="java">Map<String, Long> collect = wordsList.stream()
    .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));</code>

<code class="java">Map<String, Integer> collect = wordsList.stream()
     .collect(Collectors.groupingBy(Function.identity(), Collectors.summingInt(e -> 1)));</code>

<code class="java">LinkedHashMap<String, Long> countByWordSorted = collect.entrySet()
            .stream()
            .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
            .collect(Collectors.toMap(
                    Map.Entry::getKey,
                    Map.Entry::getValue,
                    (v1, v2) -> {
                        throw new IllegalStateException();
                    },
                    LinkedHashMap::new
            ));</code>