Image de fond d'une Fenêtre en Java

package hacktrack.framebackground;

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.MediaTracker;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class FrameBackgroundDemo extends JFrame {
	private BufferedImage backroundImage;
	private int counter;
	private Container c;

	public FrameBackgroundDemo() {
		super();
		this.init();
	}

	private void init() {
		counter = 0;
		c = new ImageContentPane();
		setContentPane(c);
		setSize(500, 300);
		for (int i = 0; i < 25; i++) {
			c.add(createLabel());
		}
	}

	private JLabel createLabel() {
		counter++;
		JLabel label = new JLabel("Demo label " + counter);
		label.setPreferredSize(new Dimension(100, 40));
		label.setBorder(BorderFactory.createLineBorder(Color.WHITE));
		return label;
	}

	private void preloadImage() throws IOException {
		backroundImage = ImageIO.read(this.getClass().getResourceAsStream(
				"machinarium.jpg"));
	}

	class ImageContentPane extends JPanel {
		public ImageContentPane() {
			super();
			this.init();
		}

		private void init() {
			MediaTracker mediaTracker = new MediaTracker(this);
			try {
				backroundImage = ImageIO.read(this.getClass()
						.getResourceAsStream("machinarium.jpg"));
				mediaTracker.addImage(backroundImage, 0);

				mediaTracker.waitForAll();
			} catch (IOException e1) {
				e1.printStackTrace();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}

		@Override
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.drawImage(backroundImage, 0,0, null);
		}
	}

	public static void main(String[] args) {
		FrameBackgroundDemo jrframe = new FrameBackgroundDemo();
		jrframe.setVisible(true);
	}
}