Evenement de boutton en java

Bonjour,
j'ai un programme en java dessus que lorsque je clic sur le boutton, il m'affiche le courbe (panel graphique)mais la probleme que je ne trouve pas la methode de faire l'action et la synchronisation entre le boutton et la partie graphique.
aider moi svp
code de programme **************
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class dessin extends JPanel
{
dessin(){}
public void paint(Graphics g)
{

g.setColor(Color.black);
g.drawLine(5,75,500,75);
g.drawLine(5,10,5,140);
g.drawLine(3,30,7,30);

int i=0;String ch="010110";
int x1=5;
int x2=0;
int y1=75;
int y2=75;

int p=0;
for (i=0;i<6;i++)
{

if (ch.charAt(i)=='0')
{
if(p==1)
{
p=0;
g.setColor(Color.darkGray);
g.drawLine(x1,y1,x1,y2+45);
}
//x1=x2;
y1=75;
y2=75;
x2=x2+50;
g.setColor(Color.RED);
g.drawLine(x1,y1,x2,y2);
x1=x2;
}

if (ch.charAt(i)=='1')
{
if(p==0)
{
p=1;
g.setColor(Color.darkGray);
g.drawLine(x1,y1,x1,y2-45);
}
//x1=x2;
p=1;
x2=x2+50;
y1=30;
y2=30;
g.setColor(Color.red);
g.drawLine(x1,y1,x2,y2);
System.out.println(x1+","+y1+"--->"+x2+","+y2);
x1=x2;
}
}

}
}
class codage extends JFrame implements ActionListener
{
class dessin extends JPanel
{
dessin(){}
public void paint(Graphics g)
{

g.setColor(Color.black);
g.drawLine(5,75,500,75);
g.drawLine(5,10,5,140);
g.drawLine(3,30,7,30);

int i=0;String ch="010110";
int x1=5;
int x2=0;
int y1=75;
int y2=75;

int p=0;
for (i=0;i<6;i++)
{

if (ch.charAt(i)=='0')
{
if(p==1)
{
p=0;
g.setColor(Color.darkGray);
g.drawLine(x1,y1,x1,y2+45);
}
//x1=x2;
y1=75;
y2=75;
x2=x2+50;
g.setColor(Color.RED);
g.drawLine(x1,y1,x2,y2);
x1=x2;
}

if (ch.charAt(i)=='1')
{
if(p==0)
{
p=1;
g.setColor(Color.darkGray);
g.drawLine(x1,y1,x1,y2-45);
}
//x1=x2;
p=1;
x2=x2+50;
y1=30;
y2=30;
g.setColor(Color.red);
g.drawLine(x1,y1,x2,y2);
System.out.println(x1+","+y1+"--->"+x2+","+y2);
x1=x2;
}
}

}
}
JButton b=new JButton();
JLabel l=new JLabel();
JTextField f=new JTextField();
JPanel p=new JPanel();
JPanel p2=new JPanel();
int x=0;
JFrame fr=new JFrame("Mon dessin");
Graphics g1;

codage()
{
b.setText("dessinez");
l.setText("codage de nombre binaire:");
f.setColumns(8);
p.add(l);
p.add(f);
p.add(b);
dessin d= new dessin();
/// p.add(d.paint(g1));
fr.setSize(300,100);
p2.add(d);
fr.getContentPane().setLayout(new GridLayout(2,1));
fr.getContentPane().add(p);
fr.getContentPane().add(p2);
fr.setSize(400,400);
fr.setVisible(true);
b.addActionListener(this);
}

public void actionPerformed (ActionEvent e)
{
if (e.getSource()==b)
{

String s=f.getText();
System.out.println(s);
if (s.length()>8)
JOptionPane.showMessageDialog(this,"vous etes dépassé le 8 bits ","dépassement de limite", JOptionPane.WARNING_MESSAGE);

//this.paint(g1);
//this.repaint();

}

}

public static void main(String[] args)
{

new codage();
}
}

//*************** fin de programme