我刚开始使用 google drive API for java,我正在使用与网站上描述的相同代码从 google drive 检索文件列表,但该方法execute不存在:(我该怎么办?
  private static List<File> retrieveAllFiles(Drive service) throws IOException {
        List<File> result = new ArrayList<File>();
        Files.List request = service.files().list();
        do {
          try {
            FileList files = request.execute(); //The method execute() is undefined for the type Drive.Files.List
            result.addAll(files.getItems());
            request.setPageToken(files.getNextPageToken());
          } catch (IOException e) {
            System.out.println("An error occurred: " + e);
            request.setPageToken(null);
          }
        } while (request.getPageToken() != null &&
                 request.getPageToken().length() > 0);
        return result;
      }