org.apache.commons.net.ftp.FTPClientのlistFileメソッドについて

import java.io.*;
import java.net.SocketException;
import org.apache.commons.net.ftp.*;

public class FtpTest {
    public static void main(String[] args) throws Exception{
        FTPClient client = new FTPClient();
        try {
            System.out.println("開始");
            client.setDefaultPort(21);
            client.connect("XXX.XXX.XXX.XXX");  // FTPサーバーのIPアドレス
            client.login("user", "pass");       // FTPサーバーのID,パスワード
            FTPFile[] list = client.listFiles();
            for (int i=0; i<list.length; i++) {
                String name = list[i].getName();
                String group = list[i].getGroup();
                System.out.println("group : "+group);
                System.out.println("name  : "+name);
            }
        }
        catch (SocketException e) {
            throw e;
        }
        catch (IOException e) {
            throw e;
        }
        finally {
            if (client != null && client.isConnected()) {
                try {
                    client.logout();
                    client.disconnect();
                }
                catch (IOException e) {
                }
            }
            System.out.println("終了");
        }
  }
}