Java中统计每个单词出现的次数，使用Map存储并打印出最终的Map

下面是一个例子：

import java.util.HashMap;
import java.util.Map;

public class WordCount {
    public static void main(String[] args) {
        String text = "Hello world this is a test Hello";
        String[] words = text.split("\\s+"); // 按空格分割单词

        Map<String, Integer> wordCountMap = new HashMap<>();
        for (String word : words) {
            word = word.toLowerCase(); // 把单词转为小写
            if (wordCountMap.containsKey(word)) {
                wordCountMap.put(word, wordCountMap.get(word) + 1);
            } else {
                wordCountMap.put(word, 1);
            }
        }

        for (Map.Entry<String, Integer> entry : wordCountMap.entrySet()) {
            System.out.println(entry.getKey() + ": " + entry.getValue());
        }
    }
}

输出结果：

hello: 2
world: 1
this: 1
is: 1
a: 1
test: 1