Java 字符串数组最大最小唯一出现

Question

我的输入是 n 个字符串。我想获取唯一值，以及这些不区分大小写的字符串的出现次数。

我想到了获取数组中的输入；对其进行排序并进行循环以计算出现次数。还有别的办法吗？

Answer 1

您可以使用 Stream api 工具来获取您想要的内容:

List<String> list = Arrays.asList("hello","world","Hola","Mundo","hello", "world","Hola","Mundo","mundo","Hello","Hola","mundo","Mundo");

Map<String, Long> ocurrences = list
        .stream()
        .map(String::toLowerCase) // make case insensitive
        .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

System.out.println(ocurrences);

输出:

{world=2, mundo=5, hello=3, hola=3}