How to Download entire Folder located on S3 Bucket?

Here's the code to download a whole bucket (somewhat tested):

import com.amazonaws.AmazonServiceException;
import aws.example.s3.XferMgrProgress;
import com.amazonaws.services.s3.transfer.TransferManager;
import com.amazonaws.services.s3.transfer.TransferManagerBuilder;
import com.amazonaws.services.s3.transfer.MultipleFileDownload;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import java.io.*;
import com.amazonaws.auth.PropertiesFileCredentialsProvider;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.AmazonClientException;
public class S3DownloadApp {

    public static void main(String [] args){
        AWSCredentials credentials = null;
        try {
            credentials = new PropertiesFileCredentialsProvider("keys.props").getCredentials();
        } catch (Exception e) {
            throw new AmazonClientException(
                    "Cannot load the credentials from the credential profiles file. " , e);
        }

        TransferManager xfer_mgr = TransferManagerBuilder.standard().withS3Client(AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(credentials)).withRegion("us-west-2").build()).build();//TransferManagerBuilder.standard().build();

        try {
            MultipleFileDownload xfer = xfer_mgr.downloadDirectory(
                    "bucketName", null, new File("/Users/admin/Desktop/downloadFolder"));
            XferMgrProgress.showTransferProgress(xfer);
            XferMgrProgress.waitForCompletion(xfer);
        } catch (AmazonServiceException e) {
            System.err.println(e.getErrorMessage());
            System.exit(1);
        }
    }
}