PROBLEMA textfield in java

[il_ted]

salve a tutti,
sto implementando una GUI in java, ho messo uno sfondo seguendo questo codice:

import java.awt.*;import javax.imageio.*;
import javax.swing.*;
import java.io.*;
import java.awt.image.BufferedImage;


import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;


import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class Sfondo {


  public static void main(String[] args) {
    ImagePanel panel = new ImagePanel(new ImageIcon("13.jpg").getImage());


    JFrame frame = new JFrame();
    frame.getContentPane().add(panel);
    frame.pack();
    frame.setVisible(true);
    frame.setSize(505, 355);
    TextField t = new TextField(50);
    t.setBackground(Color.white);
  }
}

import java.awt.*;import javax.imageio.*;
import javax.swing.*;
import java.io.*;
import java.awt.image.BufferedImage;


import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;


import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;


class ImagePanel extends JPanel {


  private Image img;


  public ImagePanel(String img) {
    this(new ImageIcon(img).getImage());
  }


  public ImagePanel(Image img) {
    this.img = img;
    Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
    setPreferredSize(size);
    setMinimumSize(size);
    setMaximumSize(size);
    setSize(size);
    setLayout(null);
  }


  public void paintComponent(Graphics g) {
    g.drawImage(img, 0, 0, null);
  }


}

fino a qui tutto ok :ok:

ma da qui in poi non so come implementare un textfield o quant'altro.... io le metto ma non mi viene visualizzato nulla :muro:

come devo fare?
ho provato a creare un pannello ecc ma non ci sono riuscito :( aiutooo :inchino: