如何使用dropbox java api同时上传多个文件

I would like to know how to upload multiple files to dropbox using the java dropbox api. I would like to know this as currently, when I want to upload a folder, I recursively go through every file in the folder and upload them one by one. However, I find this too slow. So, I thought that I could just upload all the files in a folder at once. But, how would I do this? Should I create n number of threads and each thread uploads a single file or what? I would like to know how to upload multiple fil