זקוק לעזרה במציאת באג בתוכנית JAVA

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package test;

import java.awt.*;

import java.awt.event.*;

public class NewClass {

private static Label l=new Label("event chk",Label.CENTER);

public static void main(String[] args)

{

Frame f=new Frame("event chk");

Canvas c=new Canvas();

f.setSize(new Dimension(400,400));

c.setSize(new Dimension(100,100));

Graphics g=c.getGraphics();

c.repaint();

f.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

f.add©;

f.show();

g=c.getGraphics();

g.drawString("dfosdfosdfosdfoi", 30, 30);

}

}