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Problem with Background

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I wrote a class that is suppose to draw a red rectangle in a JPanel with and the background of the panel is suppose to be black here is my code

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Graphics;

public class View extends JFrame
private JPanel panel = new JPanel();
public void paint(Graphics g)
g.drawRect(20, 50, 100, 100);
public View()
setSize(640, 480);
panel.setSize(640, 480);

public static void main(String[] args)
View view = new View();


and here is what I get as a result there appears to be some glitch in the background

(this is a screen of the gui from my code not a minimized Eclipse)

and here is how it is without the paint method it does as it suppose to making a window with a black background

[attachment=7845:without paint method.PNG]

Is it something wrong with my code that it does like that or there is something wrong with my computer ?

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