diff --git a/u08/Wurzel.class b/u08/Wurzel.class
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diff --git a/u08/Wurzel.java b/u08/Wurzel.java
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+++ b/u08/Wurzel.java
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+/**
+ Klasse zum Wurzel Ziehen
+ */
+public class Wurzel {
+    /**
+     Zieht die n-te Wurzel einer Zahl
+     */
+    public static double zahlHoch1Durchn(double zahl, int wurzelexponent) {
+        return Math.pow(zahl, 1.0 / wurzelexponent);
+    }
+}
diff --git a/u09/Cent.java b/u09/Cent.java
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+/**
+ Klasse zum errechnen der Cent-Stuecke
+ */
+public class Cent {
+    /**
+     Gibt aus, wie viele 20-Cent stuecke optimal in einem Geldbetrag enthalten sind
+     */
+    public static int zaehle20CentStuecke(int cent) {
+        return cent % 100 / 20;
+    }
+}
diff --git a/u10/Swap.class b/u10/Swap.class
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diff --git a/u10/Swap.java b/u10/Swap.java
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+import java.awt.*;
+public class Swap {
+    public static void main(String[] args) {
+        Point p1= new Point(5, 2);
+        Point p2= new Point(-3, 6);
+        swapPoints(p1, p2);
+        System.out.println("p1: ("+p1.x+", "+p1.y+")");
+        System.out.println("p2: ("+p2.x+", "+p2.y+")");
+    }
+    
+    public static void swapPoints(Point p1, Point p2) {
+        Point ptmp = new Point(p1.x, p1.y);
+        p1.setLocation(p2.x, p2.y);
+        p2.setLocation(ptmp.x, ptmp.y);
+    }
+}