如何用java中的另一个单词替换字符串中单词的所有出现？

public class ReplaceWord {
    public static void main(String[] args) {
        String originalString = "这是一个测试字符串，包含需要替换的单词。";
        String wordToReplace = "替换";
        String replacementWord = "更换";

        String replacedString = originalString.replaceAll("\\b" + wordToReplace + "\\b", replacementWord);

        System.out.println("原始字符串：" + originalString);
        System.out.println("替换后的字符串：" + replacedString);
    }
}