Dark Angel's questions

我有以下数组作为输入

String[] input = new String[] {
       "This is a sample string",
       " string ",                   // additional spaces here cause issues while splitting
       "Another sample string",
       "This is not    a sample string"
};

我需要计算单个单词的频率。所需的输出是：

{a=2, not=1, string=4, This=2, is=2, sample=3, Another=1}

到目前为止，我得到了一些可行的代码：

// 1. Convert String[] into a single " " delimited String 
String joined = String.join(" ", input);

// 2. Split on " " and then calculate count using Collectors.groupingBy
Map <String, Long> output = 
        Arrays
            .stream(joined.split(" "))
            .filter(s -> !s.equals(""))    // To Deal with Empty Strings
            .collect(
                Collectors.groupingBy(
                    Function.identity(),
                    Collectors.counting()
                )
            );

System.out.println(output);

这对我来说看起来很粗糙，请建议一种使用 Streams API 来实现此目的的更好方法。