3 files changed, 40 insertions, 12 deletions
diff --git a/src/de/fhswf/in/inf/java1/aufgabe5/Bank.java b/src/de/fhswf/in/inf/java1/aufgabe5/Bank.java
index 2878adb..22cb577 100644
--- a/src/de/fhswf/in/inf/java1/aufgabe5/Bank.java
+++ b/src/de/fhswf/in/inf/java1/aufgabe5/Bank.java
@@ -33,7 +33,7 @@ public final class Bank
    {
       Person dieter = new Person("Dieter", "Hallowegers");
 
-      Konto giro = new Konto(dieter, new BigDecimal(100), new BigDecimal(0));
+      Konto giro = new Konto(dieter, new BigDecimal(100));
 
       try
       {
diff --git a/src/de/fhswf/in/inf/java1/aufgabe5/Konto.java b/src/de/fhswf/in/inf/java1/aufgabe5/Konto.java
index a2af51c..faac8f6 100644
--- a/src/de/fhswf/in/inf/java1/aufgabe5/Konto.java
+++ b/src/de/fhswf/in/inf/java1/aufgabe5/Konto.java
@@ -27,10 +27,8 @@ public class Konto
     *           Owner of the account
     * @param dispo
     *           Dispo of the account
-    * @param guthaben
-    *           Initial balance of the account
     */
-   public Konto(Person besitzer, BigDecimal dispo, BigDecimal guthaben)
+   public Konto(Person besitzer, BigDecimal dispo)
    {
 
       if (besitzer == null)
@@ -41,14 +39,16 @@ public class Konto
       {
          throw new IllegalArgumentException("Dispo can't be null");
       }
-      if (guthaben == null)
+      if (dispo.compareTo(BigDecimal.ZERO) < 0)
       {
-         throw new IllegalArgumentException("Guthaben can't be null");
+         throw new IllegalArgumentException("Dispo can't be negative");
       }
 
       this.besitzer = besitzer;
       this.dispo = dispo;
-      this.guthaben = guthaben;
+      this.guthaben = new BigDecimal(0);
+      
+      this.besitzer.addKonto(this);
 
    }
 
@@ -111,9 +111,9 @@ public class Konto
     *
     * @return Returns the owners name.
     */
-   public String getBesitzer()
+   public Person getBesitzer()
    {
-      return besitzer.getName();
+      return besitzer;
    }
 
 }
diff --git a/src/de/fhswf/in/inf/java1/aufgabe5/Person.java b/src/de/fhswf/in/inf/java1/aufgabe5/Person.java
index bfe19d0..15de304 100644
--- a/src/de/fhswf/in/inf/java1/aufgabe5/Person.java
+++ b/src/de/fhswf/in/inf/java1/aufgabe5/Person.java
@@ -3,6 +3,9 @@
  */
 package de.fhswf.in.inf.java1.aufgabe5;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * A person which can own an account.
  *
@@ -15,6 +18,8 @@ public class Person
 
    private String nachname;
 
+   private List<Konto> kontenliste = new ArrayList<>();
+
    /**
     * Creates a person with first and last name.
     *
@@ -33,11 +38,11 @@ public class Person
       {
          throw new IllegalArgumentException("Nachname can't be null");
       }
-      if (vorname == "")
+      if (vorname.isEmpty())
       {
          throw new IllegalArgumentException("Vorname can't be empty");
       }
-      if (nachname == "")
+      if (nachname.isEmpty())
       {
          throw new IllegalArgumentException("Nachname can't be empty");
       }
@@ -50,9 +55,32 @@ public class Person
     *
     * @return Returns the full name of the person
     */
-   public String getName()
+   @Override
+   public String toString()
    {
       return vorname + " " + nachname;
    }
 
+   /**
+    * For adding the back reference to the Konto.
+    *
+    * @param konto
+    *           Konto that will be added to the person.
+    */
+   public void addKonto(Konto konto)
+   {
+      if (konto == null)
+      {
+         throw new IllegalArgumentException("Konto can't be empty");
+      }
+      if (konto.getBesitzer() != this)
+      {
+         throw new IllegalArgumentException("Person must be owner of Konto");
+      }
+      if (!kontenliste.contains(konto))
+      {
+         kontenliste.add(konto);
+      }
+   }
+
 }