Java统计字符串每个单词出现次数

好的，这是一个可以回答的问题。您可以使用HashMap和正则表达式来完成此任务。首先将字符串分割成单词，然后使用HashMap存储每个单词的出现次数。以下是一个简单的Java代码示例：

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {
        String str = "This is a test string. This string is to test the Java code.";
        HashMap<String, Integer> wordCountMap = new HashMap<>();

        // Split the string into words
        String[] words = str.split("\\s+");

        // Count the frequency of each word
        for (String word : words) {
            if (wordCountMap.containsKey(word)) {
                wordCountMap.put(word, wordCountMap.get(word) + 1);
            } else {
                wordCountMap.put(word, 1);
            }
        }

        // Print the word count
        for (String word : wordCountMap.keySet()) {
            System.out.println(word + " : " + wordCountMap.get(word));
        }
    }
}

输出将为：

This : 2
is : 2
a : 1
test : 2
string. : 1
string : 1
to : 1
the : 1
Java : 1
code. : 1