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如何计算Java 8中List的单词频率？

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

结果必须是:

{ciao=2, hello=1, bye=2}

我想知道如何由 COUNT 然后由 ASC 订购。

Stream<String> fruits = Stream.of("apple", "orange", "ananas");

Map<String, Long> letters =
   fruits.map(w -> w.split(""))
              .flatMap(Arrays::stream)
              .collect(groupingBy(identity(), counting()));

输出：

{p=2, a=5, r=1, s=1, e=2, g=1, l=1, n=3, o=1}`

期望的输出：

{a=5, n=3, e=2, p=2, g=1, l=1, r=1, s=1, o=1}