Java8 Stream Collectors groupingBy使用

分组List并显示其总数。

@Testpublic void test8() {//3 apple, 2 banana, others 1List<String> items =Arrays.asList("apple", "apple", "banana","apple", "orange", "banana", "papaya");Map<String, Long> result =items.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));System.out.println(result);}

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