diff -rupN kulka.orig/Kulka.java kulka/Kulka.java
--- kulka.orig/Kulka.java	2009-05-11 09:00:32.000000000 +0200
+++ kulka/Kulka.java	2009-05-11 09:22:50.000000000 +0200
@@ -19,6 +19,32 @@ public class Kulka {
 }

 /**
+ * Runnable, która animuje piłkę.
+ */
+class PilkaRunnable implements Runnable {
+	public PilkaRunnable(Pilka aBall, Component aComponent) {
+		ball = aBall;
+		component = aComponent;
+	}
+
+	public void run() {
+		try {
+			for (int i = 1; i <= STEPS; i++) {
+				ball.Ruch(component.getBounds());
+				component.repaint();
+				Thread.sleep(DELAY);
+			}
+		} catch (InterruptedException e) {
+		}
+	}
+
+	private Pilka ball;
+	private Component component;
+	public static final int STEPS = 1000;
+	public static final int DELAY = 5;
+}
+
+/**
  * Frame z piłką i guzikami
  */
 class KulkaFrame extends JFrame {
@@ -65,16 +91,10 @@ class KulkaFrame extends JFrame {
 	 */
 	public void addPilka() {

-		try {
-			Pilka pilka = new Pilka();
-			panel.add(pilka);
-
-			for (int i = 1; i <= STEPS; i++) {
-				pilka.Ruch(panel.getBounds());
-				panel.paint(panel.getGraphics());
-				Thread.sleep(DELAY);
-			}
-		} catch (InterruptedException e) {
-		}
+		Pilka pilka = new Pilka();
+		panel.add(pilka);
+		Runnable r = new PilkaRunnable(pilka, panel);
+		Thread t = new Thread(r);
+		t.start();
 	}
 }