Bank-Beispiel/src/de/hs_mannheim/informatik/bank/domain/Bank.java

@@ -2,7 +2,6 @@ package de.hs_mannheim.informatik.bank.domain;
 
 import java.io.Serializable;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 
 public class Bank implements Serializable {

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, Comparable {
+public class Konto implements Serializable {
 	private int nummer;
 	protected long stand = 0;
 	private String inhaber;
@@ -23,7 +23,7 @@ public class Konto implements Serializable, Comparable {
 
 	@Override
 	public String toString() {
-		return "Konto "+ stand + "[nummer=" + nummer + ", inhaber=" + inhaber + "]";
+		return "Konto [nummer=" + nummer + ", inhaber=" + inhaber + "]";
 	}
 
 	public String getInhaber() {
@@ -73,12 +73,4 @@ public class Konto implements Serializable, Comparable {
 		return saldo;
 	}
 
-	@Override
-	public int compareTo(Object other) {
-		Konto kOther = (Konto) other;
-		
-//		return (int) (this.stand - kOther.stand);
-		return this.inhaber.compareTo(kOther.inhaber);
-	}
-
 }

Bank-Beispiel/src/de/hs_mannheim/informatik/bank/facade/Banksystem.java

@@ -1,9 +1,6 @@
 package de.hs_mannheim.informatik.bank.facade;
 
-import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
-import java.util.TreeSet;
 
 import de.hs_mannheim.informatik.bank.domain.Bank;
 import de.hs_mannheim.informatik.bank.domain.Girokonto;
@@ -30,15 +27,10 @@ public class Banksystem {
 
 	public String[] getKontenliste() {
 		Collection<Konto> konten = bank.getKontenliste();
-
-		
-		TreeSet<Konto> ts = new TreeSet<>(konten);
-
-		
 		String[] liste = new String[konten.size()];
 
 		int i = 0;
-		for (Konto k : ts) {
+		for (Konto k : konten) {
 			liste[i++] = k.toString(); 
 		}