Give me example of drawline into child component of frame

[Guest_imported]

I want to draw line into child component of frame, not directly into frame. Thanks

 

[LeonTang]

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

public class drawLineDemo extends JFrame
{
public drawLineDemo()
{
getContentPane().setLayout(null);
setSize(200,200);

drawLinePanel dlp = new drawLinePanel();
dlp.setBounds(new Rectangle(10,10,50,50));

getContentPane().add(dlp,null);

repaint();
}

public static void main(String[] args)
{
drawLineDemo dld = new drawLineDemo();
dld.show();
}
}

class drawLinePanel extends JPanel
{
public void paintComponent(Graphics g)
{
g.drawLine(10,10,50,10);
}
}