Java Question - Background Color in a Window?

Alright, so I made this simple little window program:

import java.awt.Color;

import java.awt.Dimension;

import java.awt.EventQueue;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Toolkit;

import java.awt.geom.Ellipse2D;

import javax.swing.JComponent;

import javax.swing.JFrame;

public class windowName {

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable(){

public void run(){

SimpleFrame frame = new SimpleFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

});

}

}

class SimpleFrame extends JFrame {

public SimpleFrame(){

//The following four lines create the screenWidth and screenHeight variables

Toolkit kit = Toolkit.getDefaultToolkit();

Dimension screenSize = kit.getScreenSize();

int screenWidth = screenSize.width;

int screenHeight = screenSize.height;

//The following lines are the properties of the frame itself

setSize(screenWidth/3, screenHeight/2);

setTitle("We're going to take your name!");

setLocation(450,200);

setBackground(Color.white);

//The following 2 lines create a new panel (which will be used to draw a circle)

DrawComponent component = new DrawComponent();

add(component);

}

}

class DrawComponent extends JComponent{

public void paintComponent(Graphics g){

Graphics2D g2 = (Graphics2D) g;

}

}

Now I'm having some problems. If you noticed, I tried to set the background color of the window to white. That's all I want: a window to pop up with a white background. However, this doesn't seem to work. I'm not sure why! (As a side note, the rest of the stuff on there is what I'll be adding on soon.)

Why won't it work and how can I make it work? Thank you so much for your time!