在Java中查找并替换几个文本文件中的单词？

FileUtils

String[] files = { "file1.txt", "file2.txt", "file3.txt" };for (String file : files) {    File f = new File(file);    String content = FileUtils.readFileToString(new File("filename.txt"));    FileUtils.writeStringToFile(f, content.replaceAll("hello", "world"));}