when muse pressed the background change

i build a applet .
the applet need to change background when i click on him,
but it`s dosent work...

code:

Code:

---

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class ok extends Applet
{

        public void mousePressed( MouseEvent e ) {
                setBackground(Color.black );
        }
       
        public void paint( Graphics s)
        {
                s.setColor( Color.black );
                s.drawString(  "Groovy!", 50, 150 );
        }
 
}

---

thanks

Code:

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//  <applet code="OkApplet" width="400" height="400"></applet>
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class OkApplet extends Applet
{
    public void init()
    {
        addMouseListener(ma);
    }

    public void paint( Graphics s)
    {
        super.paint(s);
        s.setColor( Color.black );
        s.drawString(  "Groovy!", 50, 150 );
    }

    private MouseListener ma = new MouseAdapter()
    {
        Color[] colors = { Color.red, Color.blue, Color.orange };
        int index = 0;

        public void mousePressed( MouseEvent e )
        {
            index++;
            if(index > colors.length-1)
                index = 0;
            setBackground(colors[index] );
            repaint();
        }
    };       
}

---