Cannot find symbol

[sam.jj12]

I am a newbie to swings..please help me out in solving this..
I need to change the colors of circle each time the button is being clicked
I have two classes namely Gui4.java and MyDrawPanel.java ..I am trying to create an object for MyDrawPanel in Gui4 and use the getContentpane() method.I am posting t codes of both program.I am executing thro cmd prompt.

//Gui4.java
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class Gui4 implements ActionListener
{
JFrame frame;
public static void main(String[] args)
{
Gui4 gui = new Gui4();
gui.go();

}
public void go()
{
frame = new JFrame (" change colors");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
JButton button = new JButton();
button.addActionListener(this);

MyDrawPanel drawpanel = new MyDrawpanel();

frame.getContentPane().add(BorderLayout.SOUTH,butt on);

frame.getContentPane().add(BorderLayout.CENTER,dra wpanel);

frame.setSize(300,300);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent event)
{
frame.repaint();
}
}

//MyDrawPanel.java

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

class MyDrawPanel extends JPanel
{


public void paintComponent(Graphics g)
{
g.fillRect(0,0,this.getWidth(),this.getHeight());

int red = (int) (Math.random()*255);
int green = (int) (Math.random()*255);
int blue = (int) (Math.random()*255);

Color random = new Color(red,green,blue);

g.setColor(random);
g.fillOval(70,70,100,100);
}
}

And I am getting the error as follows :

D:\jp>javac Gui4.java
Gui4.java:21: error: cannot find symbol
MyDrawPanel drawpanel = new MyDrawpanel();
^
symbol: class MyDrawpanel
location: class Gui4
1 error


Please help me out in getting output.

Thanks,
sam

[sam.jj12]

sorry to all...I found the mistake..
I have used small letter while creating the object...
Plez forgive my mistake...
Thanks again ,
Sam

[DarrylBurke]

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