diff --git a/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Bank.java b/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Bank.java
index 3407c4c..9931788 100644
--- a/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Bank.java
+++ b/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Bank.java
@@ -24,13 +24,7 @@ public class Bank implements Serializable {
 	}
 	
 	public int addKonto(String name, Kontoart kontoart) {
-		Konto k;
-
-//		switch (kontoart) {
-//		case Sparkonto: System.out.println("sk"); break;
-//		case Girokonto: System.out.println("gk");
-//		}
-		
+		Konto k;		
 		if (kontoart == Kontoart.Sparkonto) 
 			k = new Konto(name, ++kontozähler);
 		else 
@@ -105,6 +99,24 @@ Collection<Konto> minus = kontenTemp.stream().filter(n -> n.getKontostand()<0)
 		
 		return minus;
 	}
+	 //Selection
+	public void sort(Comparable[] a)
+	 { 
+		 int N = a.length; // array length
+	 for (int i = 0; i < N; i++)
+	 { // Exchange a[i] with smallest entry in a[i+1...N).
+	 int min = i; // index of minimal entr.
+	 for (int j = i+1; j < N; j++)
+	 if (less(a[j], a[min])) min = j;
+	 exch(a, i, min);
+	 }
+	 } 
+	 private static boolean less(Comparable v, Comparable w)
+	 { return v.compareTo(w) < 0; }
+	 private static void exch(Comparable[] a, int i, int j)
+	 { Comparable t = a[i]; a[i] = a[j]; a[j] = t; }
+	
+	 
 	
 	
 	
diff --git a/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Konto.java b/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Konto.java
index 322227e..415ca82 100644
--- a/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Konto.java
+++ b/Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Konto.java
@@ -3,7 +3,7 @@ package de.hs_mannheim.informatik.bank.domain;
 import java.io.Serializable;
 import java.util.ArrayList;
 
-public class Konto implements Serializable {
+public class Konto implements Serializable,Comparable {
 	private int nummer;
 	protected long stand = 0;
 	private String inhaber;
@@ -77,4 +77,10 @@ public class Konto implements Serializable {
 		return k;
 	}
 
+	@Override
+	public int compareTo(Object o) {
+		
+		return this.compareTo(o);
+	}
+
 }