New to Java GUI. Can't get this to work.

[xlacrimx]

I'm only trying to create Pong. I need a JFrame that has a black background. What am I doing wrong? Here's my code so far...

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

public class Pong extends JFrame{

public Pong(){
int width = 800;
int height = 600;

setSize(width,height);
setTitle("Wacky Pong 380");
setBackground(Color.BLACK);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
setVisible(true);

}

public void draw(Graphics g){
g.setColor(Color.BLACK);
g.fillRect(0,0,getWidth(),getHeight());
}

public static void main(String[] args){

new Pong();

}

}

[berkeleybross]

the JFrame background is covered by the content pane.

also, if you want to do drawing in a JFrame, then you should put a JPanel into the JFrame, and override its paintComponent method.

[doomsword2001]

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class Pong extends JFrame{
private DrawPanel drawPanel;
private Container container;

private static int  width = 800, height = 600;

public Pong(){

container = this.getContentPane();
container.setPreferredSize(new Dimension(width,height));
setTitle("Wacky Pong 380");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
setVisible(true);
drawPanel = new DrawPanel();
container.add(drawPanel);

pack();

}

public class DrawPanel extends JPanel {
	
	public DrawPanel(){
		
	}
    public  void paintComponent(Graphics g)
   {
    g.setColor(Color.black);
    g.fillRect(0,0,width,height);
    
    g.setColor(Color.yellow);
    g.fillRect(width/3,height/3,width/4,height/4);
    }
}


}