diff --git a/.project b/.project
new file mode 100644
index 0000000..598122f
--- /dev/null
+++ b/.project
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>oop_crashkurs</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>
diff --git a/SimpleLinkedList/src/solution/ICommand.java b/SimpleLinkedList/src/solution/ICommand.java
new file mode 100644
index 0000000..99d0804
--- /dev/null
+++ b/SimpleLinkedList/src/solution/ICommand.java
@@ -0,0 +1,5 @@
+package solution;
+
+public interface ICommand<E> {
+	void execute(E e);
+}
diff --git a/SimpleLinkedList/src/solution/ISimpleList.java b/SimpleLinkedList/src/solution/ISimpleList.java
new file mode 100644
index 0000000..5b7b300
--- /dev/null
+++ b/SimpleLinkedList/src/solution/ISimpleList.java
@@ -0,0 +1,47 @@
+package solution;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Iterator;
+
+public interface ISimpleList<E> {
+	int size(); // Anzahl der Elemente in der Liste
+
+	boolean add(E e); // fügt das Element e am Ende der Liste ein, sofern es ungleich null ist:
+						// Liefert true, falls ein Element eingefügt wurde (false sonst)
+
+	boolean add(Collection<E> c); // fügt alle Elemente der Collection c ein (sofern diese nicht null sind).
+
+	boolean contains(Object o); // prüft, ob das Objekt o in der Liste enthalten ist (o == null führt zur
+								// Rückgabe false)
+
+	boolean remove(Object o); // entfernt das Objekt o aus der Liste // true: Ein Element wurde entfernt,
+								// false sonst
+
+	void forAll(ICommand<E> command); // Durchläuft alle Elemente der Liste und wendet command.execute auf jedes
+										// Element an
+
+	default void add(int i, E e) throws IndexOutOfBoundsException {
+			} // fügt das Element an der Position i ein, sofern es
+		// nicht null ist und 0 <= i <= Anzahl an Elementen
+		// gilt. Rückgabe true, false sonst.
+
+	default E get(int i) throws IndexOutOfBoundsException {
+		return null;
+	}
+
+// Liefert das Element, das an Position i steht, null falls i keinen gültigen Index darstellt.
+	default void set(int i, E e) throws IndexOutOfBoundsException {
+	}
+
+// Ersetzt das i-te Element durch e, sofern es vorhanden ist (Index gültig)
+	default boolean remove(int i) {
+		return false;
+	} // Löscht das i-te Element, sofern der Index gültig ist. Rückgabe true, false
+		// sonst.
+
+	default void sort(Comparator<E> comparator) {
+
+	}
+
+}
\ No newline at end of file
diff --git a/SimpleLinkedList/src/solution/Node.java b/SimpleLinkedList/src/solution/Node.java
new file mode 100644
index 0000000..2e0991e
--- /dev/null
+++ b/SimpleLinkedList/src/solution/Node.java
@@ -0,0 +1,31 @@
+package solution;
+
+public class Node<E> {
+	private Node<E> predecessor; // Vorgänger
+	private Node<E> successor; // Nachfolger
+	private E payload; // Nutzlast
+	
+	public Node(E payload) {
+		super();
+		this.payload = payload;
+	}
+	public Node<E> getPredecessor() {
+		return predecessor;
+	}
+	public void setPredecessor(Node<E> predecessor) {
+		this.predecessor = predecessor;
+	}
+	public Node<E> getSuccessor() {
+		return successor;
+	}
+	public void setSuccessor(Node<E> successor) {
+		this.successor = successor;
+	}
+	public E getPayload() {
+		return payload;
+	}
+	public void setPayload(E payload) {
+		this.payload = payload;
+	}
+	
+}
diff --git a/SimpleLinkedList/src/solution/SimpleLinkedList11111.java b/SimpleLinkedList/src/solution/SimpleLinkedList11111.java
new file mode 100644
index 0000000..5af5764
--- /dev/null
+++ b/SimpleLinkedList/src/solution/SimpleLinkedList11111.java
@@ -0,0 +1,182 @@
+package solution;
+
+public class SimpleLinkedList11111<E> extends AbstractSimpleList<E> {
+
+	private Node<E> firstNode;
+	private int size;
+
+	private Node<E> get(Object o) {
+
+		if (firstNode == null)
+			return null;
+
+		boolean loop = true;
+		Node<E> tmp = firstNode;
+
+		while (loop) { // hier kann auf die Nutzlast zugegriffen werden (payolad) if(Nachfolger von
+
+			if (o == null & tmp.getSuccessor() == null) {
+				return tmp;
+			}
+
+			if (o != null & tmp.getPayload().equals(o)) {
+				return tmp;
+			}
+
+			loop = tmp.getSuccessor() != null;
+			tmp = tmp.getSuccessor();
+		}
+		return null;
+
+	}
+
+	@Override
+	public int size() {
+		return size;
+
+	}
+
+	@Override
+	public boolean add(E e) {
+		if (e == null)
+			return false;
+		if (firstNode == null) {
+			firstNode = new Node<E>(e);
+			size++;
+			return true;
+		}
+
+		boolean loop = true;
+		Node<E> tmp = firstNode;
+
+		while (loop) {
+
+			loop = tmp.getSuccessor() != null;
+
+			if (!loop) {
+				Node<E> tmp2 = new Node<E>(e);
+				tmp.setSuccessor(tmp2);
+				tmp2.setPredecessor(tmp);
+				size++;
+				return true;
+			}
+
+			tmp = tmp.getSuccessor();
+		}
+		return false;
+	}
+
+	@Override
+	public boolean contains(Object o) {
+//		return this.get(o) != null;
+
+		if (o == null)
+			return false;
+		Node<E> currentNode = firstNode;
+		while (currentNode != null) {
+			if (o.equals(currentNode.getPayload())) {
+				return true;
+			}
+			currentNode = currentNode.getSuccessor();
+		}
+		return false;
+	}
+
+	@Override
+	public boolean remove(Object o) {
+//		if(this.contains(o)) {
+//			this.get(o).setPayload(null);
+//			return true;
+//		};
+//		return false;
+//		
+		if (o == null)
+			return false;
+		Node<E> currentNode = firstNode;
+
+		while (currentNode != null) {
+			if (o.equals(currentNode.getPayload())) {
+				currentNode.setPayload(null);
+				size--;
+				return true;
+			}
+			currentNode = currentNode.getSuccessor();
+		}
+		return false;
+	}
+
+	@Override
+	public void forAll(ICommand<E> command) {
+		if (command != null) {
+			Node<E> currentNode = firstNode;
+			while (currentNode != null) {
+				command.execute(currentNode.getPayload());
+				currentNode = currentNode.getSuccessor();
+			}
+		}
+	}
+
+	private Node<E> getIndex(int i) {
+		Node<E> currentNode = firstNode;
+		int currIndex = 0;
+		while (currentNode != null) {
+
+			if (currIndex >= i) {
+				if (currentNode.getPayload() != null) {
+					return currentNode;
+				}
+			}
+			currentNode = currentNode.getSuccessor();
+			currIndex++;
+		}
+		return null;
+
+	}
+
+	public E get(int i) throws IndexOutOfBoundsException {
+		return getIndex(i).getPayload();
+	}
+
+	public void set(int i, E e) throws IndexOutOfBoundsException {
+		getIndex(i).setPayload(e);
+	}
+
+	public void add(int i, E e) throws IndexOutOfBoundsException {
+		if (size == 0) {
+			if (i != 0) {
+				throw new IndexOutOfBoundsException("Index " + " out of bounds!");
+			}
+			set(0, e);
+		} else if (i == size) {
+			add(e);
+		} else if (size > 0 && i < size) {
+			Node<E> newNode = new Node<E>(e);
+			Node<E> tempNode = getIndex(i);
+			Node<E> preTempNode = getIndex(i).getPredecessor();
+
+			preTempNode.setSuccessor(newNode);
+			newNode.setPredecessor(preTempNode);
+			newNode.setSuccessor(tempNode);
+			tempNode.setPredecessor(newNode);
+		}
+	}
+
+	private void checkIndex(int i) throws IndexOutOfBoundsException {
+		if (i < 0 | i > size) {
+			throw new IndexOutOfBoundsException();
+		}
+	}
+
+	public boolean remove(int i) throws IndexOutOfBoundsException {
+		this.checkIndex(i);
+
+		if (getIndex(i) != null) {
+			getIndex(i).setPayload(null);
+			size--;
+			return true;
+		}
+
+		return false;
+	}
+
+}
diff --git a/SimpleLinkedList/src/solution/SimpleLinkedListTest11111.java b/SimpleLinkedList/src/solution/SimpleLinkedListTest11111.java
new file mode 100644
index 0000000..d60b49b
--- /dev/null
+++ b/SimpleLinkedList/src/solution/SimpleLinkedListTest11111.java
@@ -0,0 +1,11 @@
+package solution;
+
+public class SimpleLinkedListTest11111 extends SimpleListTest90 {
+
+	@Override
+	protected ISimpleList<String> getInstance1() {
+		// TODO Auto-generated method stub
+		return new SimpleLinkedList11111<String>();
+	}
+
+}