4 files changed, 287 insertions, 0 deletions
diff --git a/src/de/fhswf/in/inf/java1/aufgabe05/Bank.java b/src/de/fhswf/in/inf/java1/aufgabe05/Bank.java
new file mode 100644
index 0000000..d90c447
--- /dev/null
+++ b/src/de/fhswf/in/inf/java1/aufgabe05/Bank.java
@@ -0,0 +1,54 @@
+/**
+ * 
+ */
+package de.fhswf.in.inf.java1.aufgabe05;
+
+import java.math.BigDecimal;
+
+/**
+ * Package for main function.
+ *
+ * @author $Author: $
+ * @version $Revision: $, $Date: $ UTC
+ */
+public final class Bank
+{
+
+   /**
+    * Prevents instantiation of the unity class Bank.
+    *
+    */
+   private Bank()
+   {
+
+   }
+
+   /**
+    * Main function for testing the Bank system.
+    *
+    * @param args
+    *           Shell arguments
+    */
+   public static void main(String[] args)
+   {
+      Person dieter = new Person("Dieter", "Hallowegers");
+
+      Konto giro = new Konto(dieter, new BigDecimal(100));
+
+      try
+      {
+         giro.einzahlen(new BigDecimal(100));
+         giro.abheben(new BigDecimal(200));
+         
+         System.out.println(giro.getKontostand());
+         
+         giro.abheben(new BigDecimal(1));
+      }
+      catch (IllegalArgumentException e)
+      {
+         System.out.println(e);
+      }
+
+   }
+
+}
diff --git a/src/de/fhswf/in/inf/java1/aufgabe05/Konto.java b/src/de/fhswf/in/inf/java1/aufgabe05/Konto.java
new file mode 100644
index 0000000..235f9af
--- /dev/null
+++ b/src/de/fhswf/in/inf/java1/aufgabe05/Konto.java
@@ -0,0 +1,119 @@
+/**
+ * 
+ */
+package de.fhswf.in.inf.java1.aufgabe05;
+
+import java.math.BigDecimal;
+
+/**
+ * An implementation of the Konto class which represents a bank account.
+ *
+ * @author $Author: $
+ * @version $Revision: $, $Date: $ UTC
+ */
+public class Konto
+{
+
+   private BigDecimal guthaben;
+
+   private BigDecimal dispo;
+
+   private Person besitzer;
+
+   /**
+    * Creates an account with an owner, a dispo and an initial balance.
+    *
+    * @param besitzer
+    *           Owner of the account
+    * @param dispo
+    *           Dispo of the account
+    */
+   public Konto(Person besitzer, BigDecimal dispo)
+   {
+
+      if (besitzer == null)
+      {
+         throw new IllegalArgumentException("Besitzer can't be null");
+      }
+      if (dispo == null)
+      {
+         throw new IllegalArgumentException("Dispo can't be null");
+      }
+      if (dispo.compareTo(BigDecimal.ZERO) < 0)
+      {
+         throw new IllegalArgumentException("Dispo can't be negative");
+      }
+
+      this.besitzer = besitzer;
+      this.dispo = dispo;
+      this.guthaben = new BigDecimal(0);
+      
+      this.besitzer.addKonto(this);
+
+   }
+
+   /**
+    * Function for withdrawing money from the account.
+    *
+    * @param betrag
+    *           Amount of cash to be withdrawn
+    */
+   public void abheben(BigDecimal betrag)
+   {
+      if (betrag == null)
+      {
+         throw new IllegalArgumentException("Betrag can't be null");
+      }
+      if (betrag.compareTo(BigDecimal.ZERO) < 0)
+      {
+         throw new IllegalArgumentException("Betrag can't be negative");
+      }
+      if (guthaben.add(dispo).compareTo(betrag) < 0)
+      {
+         throw new IllegalArgumentException("Betrag surpasses dispo limit");
+      }
+
+      guthaben = guthaben.subtract(betrag);
+   }
+
+   /**
+    * Function to deposit money into the account.
+    *
+    * @param betrag
+    *           Amount of cash to be disposed
+    */
+   public void einzahlen(BigDecimal betrag)
+   {
+      if (betrag == null)
+      {
+         throw new IllegalArgumentException("Betrag can't be null");
+      }
+      if (betrag.compareTo(BigDecimal.ZERO) < 0)
+      {
+         throw new IllegalArgumentException("Betrag can't be negative");
+      }
+
+      guthaben = guthaben.add(betrag);
+   }
+
+   /**
+    * Returns the actual balance.
+    *
+    * @return Returns the actual balance.
+    */
+   public BigDecimal getKontostand()
+   {
+      return guthaben;
+   }
+
+   /**
+    * Just to get the owners name.
+    *
+    * @return Returns the owners name.
+    */
+   public Person getBesitzer()
+   {
+      return besitzer;
+   }
+
+}
diff --git a/src/de/fhswf/in/inf/java1/aufgabe05/Person.java b/src/de/fhswf/in/inf/java1/aufgabe05/Person.java
new file mode 100644
index 0000000..18b619d
--- /dev/null
+++ b/src/de/fhswf/in/inf/java1/aufgabe05/Person.java
@@ -0,0 +1,86 @@
+/**
+ * 
+ */
+package de.fhswf.in.inf.java1.aufgabe05;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A person which can own an account.
+ *
+ * @author $Author: $
+ * @version $Revision: $, $Date: $ UTC
+ */
+public class Person
+{
+   private String vorname;
+
+   private String nachname;
+
+   private List<Konto> kontenliste = new ArrayList<>();
+
+   /**
+    * Creates a person with first and last name.
+    *
+    * @param vorname
+    *           First name of the person
+    * @param nachname
+    *           Last name of the person
+    */
+   public Person(String vorname, String nachname)
+   {
+      if (vorname == null)
+      {
+         throw new IllegalArgumentException("Vorname can't be null");
+      }
+      if (nachname == null)
+      {
+         throw new IllegalArgumentException("Nachname can't be null");
+      }
+      if (vorname.isEmpty())
+      {
+         throw new IllegalArgumentException("Vorname can't be empty");
+      }
+      if (nachname.isEmpty())
+      {
+         throw new IllegalArgumentException("Nachname can't be empty");
+      }
+      this.vorname = vorname;
+      this.nachname = nachname;
+   }
+
+   /**
+    * Just for getting the persons name.
+    *
+    * @return Returns the full name of the person
+    */
+   @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);
+      }
+   }
+
+}
diff --git a/src/de/fhswf/in/inf/java1/aufgabe05/Student.java b/src/de/fhswf/in/inf/java1/aufgabe05/Student.java
new file mode 100644
index 0000000..9963af9
--- /dev/null
+++ b/src/de/fhswf/in/inf/java1/aufgabe05/Student.java
@@ -0,0 +1,28 @@
+/**
+ * 
+ */
+package de.fhswf.in.inf.java1.aufgabe05;
+
+/**
+ * Extends Person and represents a student.
+ *
+ * @author $Author: $
+ * @version $Revision: $, $Date: $ UTC
+ */
+public class Student extends Person
+{
+
+   /**
+    * Simply calls the super constructor to initialize person.
+    *
+    * @param vorname
+    *           First name of the student
+    * @param nachname
+    *           Last name of the student
+    */
+   public Student(String vorname, String nachname)
+   {
+      super(vorname, nachname);
+   }
+
+}