diff --git a/compare.md b/compare.md
index f331284..986c2f0 100644
--- a/compare.md
+++ b/compare.md
@@ -35,7 +35,7 @@ interface Comparator<T> {
 ```java
 class SortByHouseNumber implements Comparator<Adress> {
 	public int compare(Adress a1, Adress a2){
-		return a.getHouseNumber - b.getHouseNumber;
+		return a1.getHouseNumber - a2.getHouseNumber;
 	}
 }
 ```
diff --git a/iterator.md b/iterator.md
index 6cc14af..42ff525 100644
--- a/iterator.md
+++ b/iterator.md
@@ -6,4 +6,42 @@ header: Programmieren 1 **Tutorium**
 footer: Henri Burau und Eva Meinen
 -->
 
-# Iterator
+# Interface Iterable
+
+zum Iterieren über eine Collection
+
+```java
+interface Iterable<T>{
+	Iterator<T> iterator();
+}
+```
+
+liefert Iterator über Elemente
+
+```java
+interface Iterator<T>{
+	boolean hasNext();
+	T next();
+	void remove();
+}
+```
+
+---
+
+Anwendung:
+
+```java
+Iterator<Adress> iterator = adresses.iterator();
+while( iterator.hasNext() ){
+	Adress ad = iterator.next();
+	System.out.printf("%s", ad.toString());
+} 
+```
+
+alternativ:
+
+```java
+for(Adress ad : adresses) {
+	System.out.printf("%s", ad.toString());
+}
+```
diff --git a/termin-8.md b/termin-8.md
index 86d4ee4..4a4800e 100644
--- a/termin-8.md
+++ b/termin-8.md
@@ -30,6 +30,6 @@ footer: Henri Burau und Eva Meinen
 # Online Fragen
 arsnova.eu/mobile
 
-Code: 84 14 84 98
+Code: 83 94 90 76
 
 ---