[Swing] problem z rysowaniem obrazka

Witam,

mam problem z narysowaniem obrazka na panelu. Oto moj kod:

import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.Rectangle;
import javax.swing.JTextPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

public class ramka extends JFrame {

	private static final long serialVersionUID = 1L;
	private JPanel jContentPane = null;
	private JButton jButton = null;
	private Url nowy;  //  @jve:decl-index=0:
	private JTable jTable = null;
	private Image wykres;  //  @jve:decl-index=0:
	Object[][] data = {
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		    {"", "","", ""},
		};


	private JButton getJButton() {
		if (jButton == null) {
			jButton = new JButton();
			jButton.setBounds(new Rectangle(551, 22, 117, 49));
			jButton.setText("Sciagnij");
			jButton.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					data = nowy.WIG20;
					nowy.run();

					repaint();
					
					Graphics g = jContentPane.getGraphics();
					g.drawImage(wykres, 400, 400, jContentPane);
					g.drawLine(400, 400, 500, 500);

					

				}
			});
		}
		return jButton;
	}

	private JTable getJTable() {
		if (jTable == null) {
			jTable = new JTable(new MyTableModel());
			jTable.setBounds(new Rectangle(28, 24, 400, 320));
		}
		return jTable;
	}


	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				ramka thisClass = new ramka();
				thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				thisClass.setVisible(true);
			}
		});
	}

	public ramka() {
		super();
		initialize();
	}

	private void initialize() {
		this.setSize(700, 400);
		this.setContentPane(getJContentPane());
		this.setTitle("JFrame");
		nowy = new Url();
		wykres = nowy.wykres;
	}

	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(null);
			jContentPane.add(getJButton(), null);
			jContentPane.add(getJTable(), null);
		}
		return jContentPane;
	}

	class MyTableModel extends AbstractTableModel{
		private static final long serialVersionUID = 1L;
		String[] columnNames = {"Nazwa",
				"[godz.]",
				"Bieżący",
				"Zm. %",};

	    MyTableModel(){
	    	super();
	    	
	    }
	    public int getColumnCount() {
	        return columnNames.length;
	    }

	    public int getRowCount() {
	        return data.length;
	    }

	    public String getColumnName(int col) {
	        return columnNames[col];
	    }

	    public Object getValueAt(int row, int col) {
	        return data[row][col];
	    }


        public Class<?> getColumnClass(int c) {
        	return getValueAt(0, c).getClass();
            
        }

        public boolean isCellEditable(int row, int col) {
        	
            if (col < 1) {
                return false;
            } else {
                return true;
            }
        }
        public void setValueAt(Object value, int row, int col) {

            
        	if(data[row][0] != ""){
                data[row][col] = (String)value;            
                fireTableCellUpdated(row, col);

        	}

            
            
            
        }


	}

}

import java.net.*; 
import java.awt.Image;
import java.io.*; 

import javax.imageio.ImageIO;
 
public class Url { 
	 String[] WIG20goly = new String[20];
	 String[][] WIG20 = new String[20][4];
	 Image wykres;
  
	
	public void run() { 

      try { 
        URL u = new URL("http://www.bankier.pl/inwestowanie/profile/quote.html?symbol=WIG20"); 
        InputStream is = u.openStream(); 
        InputStreamReader isr = new InputStreamReader(is); 
        BufferedReader br = new BufferedReader(isr); 
        String theLine; 
        int i=0;
        while ((theLine = br.readLine()) != null) { 
          if(theLine.contains("<tr align=center><td align=left><a  class=articleTitleLink href=")) {
        	  WIG20goly[i] = theLine;
        	  i++;
          }
          } 
        WIG20goly[0] = WIG20goly[0].substring(5);
        obrobka();
        URL uu = new URL("http://em.bankier.pl/Portal/Data/Charts/WIG20_S1Y.gif");
        wykres = ImageIO.read(uu); 
      } 
      catch (MalformedURLException ex) { 
        System.err.println(ex); 
      }  
      catch (IOException ex) { 
        System.err.println(ex);       
      }       
    } 
	
	public  void obrobka(){
		wyciagnijNazwe();
		wyciagnijDate();
		wyciagnijNotowanie();
		wyciagnijZmiane();
	}
	public void wyciagnijNazwe(){
		for(int i = 0; i < 20; i++){
			WIG20goly[i] = WIG20goly[i].substring(105);
			WIG20[i][0] = WIG20goly[i].substring(0,WIG20goly[i].indexOf('&'));
		}
	}
	public void wyciagnijDate(){
		for(int i = 0; i < 20; i++){
			WIG20[i][1] = WIG20goly[i].substring(WIG20goly[i].indexOf('['),WIG20goly[i].indexOf(']')+1);
		}
	}
	public void wyciagnijNotowanie(){
		for(int i = 0; i < 20; i++){
			WIG20goly[i] = WIG20goly[i].substring(WIG20goly[i].indexOf("<td class="));
			WIG20goly[i] = WIG20goly[i].substring(WIG20goly[i].indexOf(">")+1);
			WIG20[i][2] = WIG20goly[i].substring(0,WIG20goly[i].indexOf('<'));
		}
	}
	public void wyciagnijZmiane(){
		for(int i = 0; i < 20; i++){
			WIG20goly[i] = WIG20goly[i].substring(WIG20goly[i].indexOf("<td class="));
			WIG20goly[i] = WIG20goly[i].substring(WIG20goly[i].indexOf(">")+1);
			WIG20[i][3] = WIG20goly[i].substring(0,WIG20goly[i].indexOf('<'));
		}
	}
}

Druga czesc jest malo wazna, chodzi mi o to aby po wcisnieciu przycisku program wymalowywal wykres.
Metoda która powinna to robic ma nastepujaca postać:

			jButton.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					data = nowy.WIG20;
					nowy.run();

					repaint();
					
					Graphics g = jContentPane.getGraphics();
					g.drawImage(wykres, 400, 400, jContentPane);
					g.drawLine(400, 400, 500, 500);

					

				}
			});

Guzik uzupełnia tabelke a nastepnie odrysowuje wykres i rysuje linie (testowo), przez ułamek sekundy widze linie a obrazka wcale.

Prosze o pomoc.