diff --git a/src/main/java/_6/_1/HashMapMultiSet.java b/src/main/java/_6/_1/HashMapMultiSet.java
new file mode 100644
index 0000000..66e0377
--- /dev/null
+++ b/src/main/java/_6/_1/HashMapMultiSet.java
@@ -0,0 +1,41 @@
+package _6._1;
+
+import java.util.HashMap;
+import java.util.Iterator;
+
+public class HashMapMultiSet<T> implements MultiSet<T> {
+    private HashMap<T,Integer> map = new HashMap<>();
+
+    public Iterator<T> iterator() {
+        return new HashMapMultiSetIterator();
+    }
+
+    public void add(T element) {
+        if (map.containsKey(element)) {
+            map.put(element,map.get(element)+1);
+        } else {
+            map.put(element,1);
+        }
+    }
+
+    public int count(T element) {
+        if (map.containsKey(element)) {
+            return map.get(element);
+        }
+        return 0;
+    }
+
+    class HashMapMultiSetIterator implements Iterator<T> {
+        @Override
+        public boolean hasNext() {
+            return map.keySet().iterator().hasNext();
+        }
+
+        @Override
+        public T next() {
+            return map.keySet().iterator().next();
+        }
+
+    }
+
+}
diff --git a/src/main/java/_6/_1/MultiSet.java b/src/main/java/_6/_1/MultiSet.java
new file mode 100644
index 0000000..d97e891
--- /dev/null
+++ b/src/main/java/_6/_1/MultiSet.java
@@ -0,0 +1,14 @@
+package _6._1;
+
+/* a) REGENWETTER
+* Menge: {R,E,G,N,W,T}
+* Multimenge: {(R,2),(E,4),(G,1),(N,1),(W,1),(T,2)}
+*/
+
+public interface MultiSet<T> extends Iterable<T>{
+    void add(T element);
+
+    int count(T element);
+}
+
+
diff --git a/src/main/resources/6/1_Menge&Multimenge b/src/main/resources/6/1_Menge&Multimenge
new file mode 100644
index 0000000..a75a9da
--- /dev/null
+++ b/src/main/resources/6/1_Menge&Multimenge
@@ -0,0 +1,4 @@
+A Menge alles Großbuchstaben
+REGENWETTER
+Menge: {R,R,E,E,E,G,N,W,T,T} oder {R,E,G,N,W,T}
+Multimenge: {(R,2), (E,3), (G,1), (N,1), (W,1), (T,2)}
\ No newline at end of file
diff --git a/src/main/resources/6/2_Exceptions&Generic b/src/main/resources/6/2_Exceptions&Generic
new file mode 100644
index 0000000..a60cf6d
--- /dev/null
+++ b/src/main/resources/6/2_Exceptions&Generic
@@ -0,0 +1,17 @@
+try {
+// ...
+} catch (GenericException <Integer > e) {
+// ...
+} catch (GenericException <Double > e) {
+// ...
+}
+Das funktioniert nicht zur Laufzeit, da Aufgrund von Type Erasure
+wir zwei gleiche catch hätten.
+
+try {
+throw new GenericException <Number >();
+} catch (GenericException <Integer > e) {
+// ...
+}
+
+Auch hier funktioniert das nicht zur Laufzeit aufgrund von Tyüpe Erasure.