diff --git a/src/de/dhbwka/java/exercise/classes/Account.java b/src/de/dhbwka/java/exercise/classes/Account.java
new file mode 100644
index 0000000..4fd9c36
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/Account.java
@@ -0,0 +1,61 @@
+package de.dhbwka.java.exercise.classes;
+
+public class Account {
+  private long AccountNumber;
+  private String AccountHolder;
+  private long AccountBalance;
+  private long OverdraftLimit;
+
+  public Account(long accountNumber, String accountHolder, long accountBalance, long overdraftLimit) {
+    AccountNumber = accountNumber;
+    AccountHolder = accountHolder;
+    AccountBalance = accountBalance;
+    OverdraftLimit = overdraftLimit;
+  }
+
+  public Account(long accountNumber, String accountHolder) {
+    this(accountNumber, accountHolder, 0, 0);
+  }
+
+  public long getAccountBalance() {
+    return AccountBalance;
+  }
+
+  public String getAccountHolder() {
+    return AccountHolder;
+  }
+
+  public long getAccountNumber() {
+    return AccountNumber;
+  }
+
+  public long getOverdraftLimit() {
+    return OverdraftLimit;
+  }
+
+  public void setAccountHolder(String accountHolder) {
+    AccountHolder = accountHolder;
+  }
+
+  public void setOverdraftLimit(long overdraftLimit) {
+    OverdraftLimit = overdraftLimit;
+  }
+
+  public void processDeposit(long amount) {
+    AccountBalance += amount;
+  }
+
+  public void processPayment(long amount) {
+    if (AccountBalance - amount < -OverdraftLimit) {
+      System.out.println("Deckung nicht ausreichend.");
+    } else {
+      AccountBalance -= amount;
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "Konto Nr. " + AccountNumber + " (" + AccountHolder + ") Stand: " + AccountBalance + "ct Limit: "
+        + OverdraftLimit + "ct";
+  }
+}
diff --git a/src/de/dhbwka/java/exercise/classes/AccountTest.java b/src/de/dhbwka/java/exercise/classes/AccountTest.java
new file mode 100644
index 0000000..69a7b43
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/AccountTest.java
@@ -0,0 +1,14 @@
+package de.dhbwka.java.exercise.classes;
+
+public class AccountTest {
+  public static void main(String[] args) {
+    Account account = new Account(4711, "Donald Duck", 500, 1000);
+    System.out.println(account);
+    account.processDeposit(200);
+    System.out.println(account);
+    account.processPayment(400);
+    System.out.println(account);
+    account.processPayment(2000);
+    System.out.println(account);
+  }
+}
diff --git a/src/de/dhbwka/java/exercise/classes/Point.java b/src/de/dhbwka/java/exercise/classes/Point.java
new file mode 100644
index 0000000..0ca1c07
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/Point.java
@@ -0,0 +1,56 @@
+package de.dhbwka.java.exercise.classes;
+
+public class Point {
+  private double x;
+  private double y;
+
+  public Point() {
+    this(0, 0);
+  }
+
+  public Point(double x, double y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  public double getX() {
+    return x;
+  }
+
+  public void setX(double x) {
+    this.x = x;
+  }
+
+  public double getY() {
+    return y;
+  }
+
+  public void setY(double y) {
+    this.y = y;
+  }
+
+  @Override
+  public String toString() {
+    return "(" + x + ", " + y + ")";
+  }
+
+  public double distanceFromOrigin() {
+    return Math.sqrt(x * x + y * y);
+  }
+
+  public Point mirrorX() {
+    return new Point(x, -y);
+  }
+
+  public Point mirrorY() {
+    return new Point(-x, y);
+  }
+
+  public Point mirrorOrigin() {
+    return new Point(-x, -y);
+  }
+
+  public double getDistance(Point p) {
+    return Math.sqrt(Math.pow(p.x - x, 2) + Math.pow(p.y - y, 2));
+  }
+}
diff --git a/src/de/dhbwka/java/exercise/classes/PointTest.java b/src/de/dhbwka/java/exercise/classes/PointTest.java
new file mode 100644
index 0000000..8bb02bd
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/PointTest.java
@@ -0,0 +1,16 @@
+package de.dhbwka.java.exercise.classes;
+
+public class PointTest {
+  public static void main(String[] args) {
+    Point pointA = new Point(4.0, 2.0);
+    System.out.println("A: " + pointA);
+    Point pointB = new Point(-1.0, -1.0);
+    System.out.println("B: " + pointB);
+    System.out.println("Abstand A-B: "
+        + pointA.getDistance(pointB));
+    pointA = pointA.mirrorOrigin();
+    System.out.println("A': " + pointA);
+    System.out.println("Abstand A'-B: "
+        + pointA.getDistance(pointB));
+  }
+}
diff --git a/src/de/dhbwka/java/exercise/classes/Radio.java b/src/de/dhbwka/java/exercise/classes/Radio.java
new file mode 100644
index 0000000..2a3244e
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/Radio.java
@@ -0,0 +1,52 @@
+package de.dhbwka.java.exercise.classes;
+
+public class Radio {
+  private boolean on;
+  private int volume;
+  private double frequency;
+
+  public Radio() {
+    this.on = false;
+    this.volume = 0;
+    this.frequency = 85.0;
+  }
+
+  public Radio(boolean on, int volume, double frequency) {
+    this.on = on;
+    this.volume = Math.max(Math.min(volume, 10), 0);
+    this.frequency = Math.max(Math.min(frequency, 110.0), 85.0);
+  }
+
+  public void turnOn() {
+    this.on = true;
+  }
+
+  public void turnOff() {
+    this.on = false;
+  }
+
+  public void incVolume() {
+    if (this.volume < 10) {
+      this.volume++;
+    }
+  }
+
+  public void decVolume() {
+    if (this.volume > 0) {
+      this.volume--;
+    }
+  }
+
+  public void setFrequency(double frequency) {
+    if (frequency >= 85.0 && frequency <= 110.0) {
+      this.frequency = frequency;
+    } else {
+      this.frequency = 99.9;
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "Radio " + (this.on ? "an" : "aus") + ": Freq=" + this.frequency + ", Laut=" + this.volume;
+  }
+}
diff --git a/src/de/dhbwka/java/exercise/classes/RadioTest.java b/src/de/dhbwka/java/exercise/classes/RadioTest.java
new file mode 100644
index 0000000..0ebf28f
--- /dev/null
+++ b/src/de/dhbwka/java/exercise/classes/RadioTest.java
@@ -0,0 +1,24 @@
+package de.dhbwka.java.exercise.classes;
+
+public class RadioTest {
+  public static void main(String[] args) {
+    Radio radio = new Radio(false, 7, 93.5);
+    System.out.println(radio);
+    radio.turnOn();
+    System.out.println(radio);
+    radio.incVolume();
+    radio.incVolume();
+    System.out.println(radio);
+    radio.incVolume();
+    radio.incVolume();
+    System.out.println(radio);
+    radio.decVolume();
+    System.out.println(radio);
+    radio.setFrequency(97.8);
+    System.out.println(radio);
+    radio.setFrequency(112.7);
+    System.out.println(radio);
+    radio.turnOff();
+    System.out.println(radio);
+  }
+}