Two classes included in this code
---------------------------------------------------------

package twotees.desktop.gui;

import java.awt.Dimension;

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

import twotees.desktop.gui.widgets.StatusBar;

public class TestCase
{
	public TestCase()
	{
		JFrame frame = new JFrame("Test Case");
		frame.setSize(new Dimension(500, 500));
		JPanel pane = new JPanel();
		pane.add(new StatusBar(5));
		frame.add(pane);
		pane.setVisible(true);
		frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{
		new TestCase();
	}
}

------------------------------------------------------------------------------

package twotees.desktop.gui.widgets;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.util.ArrayList;

import javax.swing.ImageIcon;
import javax.swing.JLabel;

/**
 * Represents a status bar that has a certain number of steps, each of which is completed over time
 * @author Henri Cook
 */
public class StatusBar extends JLabel implements ImageObserver
{
	private static final long serialVersionUID = 1L;
	
	private ArrayList<ImageIcon> parts = new ArrayList<ImageIcon>();
	
	public StatusBar (int steps)
	{
		if (steps < 2) throw new IllegalArgumentException ("Status Bars must have at least two states");
		
		parts.add(new ImageIcon(StatusBar.class.getResource("/images/statusbar-left-filled.jpg").getPath()));
		
		for (int i=1; i<steps-1; i++)
		{
			parts.add(new ImageIcon(StatusBar.class.getResource("/images/statusbar-middle.jpg").getPath()));
		}
		
		parts.add(new ImageIcon(StatusBar.class.getResource("/images/statusbar-right.jpg").getPath()));
	}
	
	/**
	 * Part of ImageObserver
	 */
	public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) 
	{
		// Do nothing
		System.out.println("Image update trigger");
		return true;
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		System.out.println("Called");
		
		Graphics2D g2 = (Graphics2D) g;
		g2.drawImage(parts.get(0).getImage(), 0, 0, parts.get(0).getIconWidth(), parts.get(0).getIconHeight(), Color.white, this);
	}
}