one Media Tracker example

import java.applet.Applet;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;


public class Count2 extends Applet implements Runnable {
	Image img[] = new Image[10];
	Thread thread;
	MediaTracker tracker;

	public void init() {
		tracker = new MediaTracker(this);
		for (int i = 0; i < 10; i++) {
			img[i] = getImage(getDocumentBase(), "images/player" + i + ".png");
			tracker.addImage(img[i], 0);
		}
	}

	public void start() {
		thread = new Thread(this);
		thread.start();
	}

	public void stop() {
		thread.stop();
		thread = null;
	}

	public void run() {
		try {
			tracker.waitForID(0);
		} catch (InterruptedException e) {
			return;
		}
		repaint();
	}

	public void update(Graphics g) {
		paint(g);
	}

	public void paint(Graphics g) {
		if ((tracker.statusID(0, true) & MediaTracker.ERRORED) != 0) {
			g.setColor(Color.red);
			g.fillRect(0, 0, size().width, size().height);
			return;
		}
		if ((tracker.statusID(0, true) & MediaTracker.COMPLETE) != 0) {
			for (int i = 0; i < 10; i++)
				g.drawImage(img[i], i * 80, 0, this);
		} else {
			Font font = new Font("Verdana", Font.PLAIN, 18);
			FontMetrics fm = g.getFontMetrics(font);
			String str = new String("Loading images...");
			g.setFont(font);
			g.drawString(str, (size().width - fm.stringWidth(str)) / 2,
					((size().height - fm.getHeight()) / 2) + fm.getAscent());
		}
	}
}