Upload file to Box subfolder using Java SDK

How to upload files to my Box to the particular Sub-Folder either using by subfolder name or ID

Example say I have 2 subfolders(subfolder1 and subfolder2) in my Box, How to upload files to subfolder2 using java sdk.

Can we upload using any methods.

Successful in uploading files to Box root folder using the code below

        BoxFolder bfolder = BoxFolder.getRootFolder(api);
        FileInputStream stream= null;
        filePath = "c:\\UploadFile.txt";
         stream = new FileInputStream(filePath);
        fileName = FilenameUtils.getBaseName(filePath.toString());
        bfolder.uploadFile(stream, fileName);