Java FTP Client Apache Commons Net

package com.zybnet;

import java.io.IOException;
import java.io.OutputStream;
import java.net.SocketException;

import org.apache.commons.io.output.CountingOutputStream;
import org.apache.commons.io.output.NullOutputStream;
import org.apache.commons.net.ftp.FTPClient;

public class FTP {

    public static void main(String[] args) throws SocketException, IOException {
        FTPClient client = new FTPClient();
        client.connect("ftp.mozilla.org");
        client.login("anonymous", "");
        client.enterLocalPassiveMode();

        OutputStream out = new CountingOutputStream(new NullOutputStream()) {
            @Override
            public void beforeWrite(int count) {
                super.beforeWrite(count);
                System.out.println("Downloaded " + getCount() + " bytes");
            }
        };

        for (String filename: new String[] {"MD5SUMS", "SHA1SUMS"})
            client.retrieveFile("pub/firefox/releases/15.0b4/" + filename, out);

        out.close();
        client.disconnect();
    }

}