Java 代码统计文本中单词出现频率 - 以 'what' 为例

以下是使用 split 和 equals 方法统计句子中单词'what'出现的频率的示例代码：

public class WordFrequency {
    public static void main(String[] args) {
        String words = 'Accept what was and what is, and you'll have more positive energy to pursue what will be.';
        String[] wordArray = words.split('\s+'); // 使用空格分割句子得到单词数组

        int frequency = 0; // 统计频率的变量
        for (String word : wordArray) {
            if (word.equals('what')) { // 判断单词是否等于'what'
                frequency++; // 频率加一
            } 
        }

        System.out.println('The word 'what' appears ' + frequency + ' times.');
    }
}

输出结果为： The word 'what' appears 3 times.