Java统计英文句子中每个单词出现的次数

可以使用Java中的HashMap来实现统计英文句子中每个单词出现的次数。具体实现步骤如下：

1. 将英文句子按照空格分隔成单词数组。
2. 遍历单词数组，使用HashMap来统计每个单词出现的次数。
3. 如果单词已经在HashMap中存在，则将该单词出现次数加1；否则，将该单词加入HashMap并将出现次数初始化为1。

下面是Java代码示例：

import java.util.HashMap;

public class WordCount {
    public static void main(String[] args) {
        String sentence = "This is a test sentence. This sentence is used for testing.";
        String[] words = sentence.split(" ");

        HashMap<String, Integer> wordCount = new HashMap<>();
        for (String word : words) {
            if (wordCount.containsKey(word)) {
                wordCount.put(word, wordCount.get(word) + 1);
            } else {
                wordCount.put(word, 1);
            }
        }

        for (String word : wordCount.keySet()) {
            System.out.println(word + ": " + wordCount.get(word));
        }
    }
}

输出结果为：

This: 2
is: 2
a: 1
test: 1
sentence.: 1
sentence: 1
used: 1
for: 1
testing.: 1