Storing random background in Java

import	java.awt.image.BufferedImage;import	java.awt.Graphics;import	java.awt.Color;import	java.awt.Graphics2D;import	javax.swing.JFrame;public class RandomBackground extends JFrame {	BufferedImage	background;		public RandomBackground() {		//Create a new Image		background = new BufferedImage(800,600, BufferedImage.TYPE_3BYTE_BGR);		//Create a Graphics Context to the Image		Graphics g = background.getGraphics();		//Generate randome background		for(int t=0; t<8; t++){			g.setColor(new Color(100, 100, 200));			int x = (int)(Math.random() * 800) - 100;			int y = (int)(Math.random() * 600) - 100;			int size = (int)(Math.random() * 300);			g.fillOval(x, y, size, size);		}		//Dispose of Graphics		g.dispose();	}		public void paint(Graphics g) {		//Copy the background to the screen		g.drawImage(background,0,0,null);		//Dispose of Graphics		g.dispose();	}		public static void main(String[] args) {		RandomBackground rb = new RandomBackground();		rb.setTitle("Random Background Generator");		rb.setSize(800,600);		rb.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		rb.setResizable(false);		rb.setVisible(true);	}}