diff --git a/Technikladen/Client.java b/Technikladen/Client.java
new file mode 100755
index 0000000..3b32333
--- /dev/null
+++ b/Technikladen/Client.java
@@ -0,0 +1,37 @@
+import java.util.ArrayList;
+
+public class Client {
+	private static int clientCounter;
+	private int clientID;
+	private String clientName;
+	private String clientEmail;
+	private ArrayList<Order> clientOrders;
+	public Client(String clientName, String clientEmail) {
+		clientCounter++;
+		this.clientID = clientCounter;
+		this.clientName = clientName;
+		this.clientEmail = clientEmail;
+		this.clientOrders = new ArrayList<Order>();
+	}
+	public int getID() {
+		return this.clientID;
+	}
+	public String getName() {
+		return this.clientName;
+	}
+	public String getEmail() {
+		return this.clientEmail;
+	}
+	public ArrayList<Order> getOrders() {
+		return this.clientOrders;
+	}
+	public void addOrder(Order order) {
+		this.clientOrders.add(order);
+	}
+	public boolean hasOrder() {
+		return !this.clientOrders.isEmpty();
+	}
+	public String toString() {
+		return ("ID: " + this.clientID + ", Name: " + this.clientName + ", Email: " + this.clientEmail);
+	}
+}
diff --git a/Technikladen/Order.java b/Technikladen/Order.java
new file mode 100755
index 0000000..dc08e7c
--- /dev/null
+++ b/Technikladen/Order.java
@@ -0,0 +1,42 @@
+import java.util.ArrayList;
+
+public class Order {
+	private int orderClientID;
+	private ArrayList<OrderEntry> orderEntries;
+	private String orderDate;
+	public Order(int clientID, String date) {
+		this.orderClientID = clientID;
+		this.orderEntries = new ArrayList<OrderEntry>();
+		this.orderDate = date;
+	}
+	public int getClientID() {
+		return this.orderClientID;
+	}
+	public String getDate() {
+		return this.orderDate;
+	}
+	public ArrayList<OrderEntry> getEntries() {
+		return this.orderEntries;
+	}
+	public void addEntry(OrderEntry entry) {
+		this.orderEntries.add(entry);
+	}
+	public int calcPrice() {
+		int price = 0;
+		for (OrderEntry entry : this.orderEntries) {
+			price += entry.calcPrice();
+		}
+		return price;
+	}
+	public String createReceipt() {
+		String output = "\n";
+		for (OrderEntry entry : this.orderEntries) {
+			output += entry.toString() + ", Price: " + entry.calcPrice() + "\n";
+		}
+		output += "=====" + this.calcPrice() + "=====";
+		return output;
+	}
+	public String toString() {
+		return ("Client: " + this.orderClientID + ", Date: " + this.orderDate);
+	}
+}
diff --git a/Technikladen/OrderEntry.java b/Technikladen/OrderEntry.java
new file mode 100755
index 0000000..9d47921
--- /dev/null
+++ b/Technikladen/OrderEntry.java
@@ -0,0 +1,14 @@
+public class OrderEntry {
+	private Product orderProduct;
+	private int entryAmount;
+	public OrderEntry(Product product, int amt) {
+		this.orderProduct = product;
+		this.entryAmount = amt;
+	}
+	public int calcPrice() {
+		return this.entryAmount * this.orderProduct.getPrice();
+	}
+	public String toString() {
+		return ("Product: " + this.orderProduct.getName() + ", Amount: " + this.entryAmount);
+	}
+}
diff --git a/Technikladen/OrderSystem.java b/Technikladen/OrderSystem.java
new file mode 100755
index 0000000..5f08c11
--- /dev/null
+++ b/Technikladen/OrderSystem.java
@@ -0,0 +1,55 @@
+import java.util.ArrayList;
+
+public class OrderSystem {
+	private StorageManager systemManager;
+	private ArrayList<Client> systemClients;
+	public OrderSystem(StorageManager manager) {
+		this.systemManager = manager;
+		this.systemClients = new ArrayList<Client>();
+	}
+	public void addProduct(Product product) {
+		this.systemManager.addProduct(product);
+	}
+	public void addClient(Client client) {
+		this.systemClients.add(client);
+	}
+	public Client getClientByID(int id) {
+		for (Client client : this.systemClients) {
+			if (client.getID() == id) {
+				return client;
+			}
+		}
+		return new Client("", "");
+	}
+	public void createOrder(int id, Order order) {
+		this.getClientByID(id).addOrder(order);
+	}
+	public ArrayList<Client> getClients() {
+		return this.systemClients;
+	}
+	public Product getProductByID(int id) {
+		for (Product product : this.systemManager.getStorage()) {
+			if (product.getID() == id) {
+				return product;
+			}
+		}
+		return new Product(-1, "", 0, 0);
+	}
+	public StorageManager getManager() {
+		return this.systemManager;
+	}
+	public void showClients() {
+		for (Client client : this.systemClients) {
+			System.out.println(client.toString());
+		}
+	}
+	public void showProducts() {
+		if (this.systemManager.getStorage().isEmpty()) {
+			System.out.println("No products exist");
+			return;
+		}
+		for (Product product : this.systemManager.getStorage()) {
+			System.out.println("ID: " + product.getID() + ", Name: " + product.getName() + ", Price: " + product.getPrice() + ", Amount: " + product.getAmount());
+		}
+	}
+}
diff --git a/Technikladen/Product.java b/Technikladen/Product.java
new file mode 100755
index 0000000..3471cd3
--- /dev/null
+++ b/Technikladen/Product.java
@@ -0,0 +1,34 @@
+public class Product {
+	private int productID;
+	private String productName;
+	private int productPrice;
+	private int productAmount;
+	public Product(int id, String name, int price, int amt) {
+		this.productID = id;
+		this.productName = name;
+		this.productPrice = price;
+		this.productAmount = amt;
+	}
+	public int getID() {
+		return this.productID;
+	}
+	public String getName() {
+		return this.productName;
+	}
+	public int getPrice() {
+		return this.productPrice;
+	}
+	public int getAmount() {
+		return this.productAmount;
+	}
+	public void reduceAmount(int amt) {
+		if (this.productAmount < amt) {
+			System.out.println("Not enough of product " + this.productID + "(" + this.productName + ") available!");
+			return;
+		}
+		this.productAmount -= amt;
+	}
+	public void increaseAmount(int amt) {
+		this.productAmount += amt;
+	}
+}
diff --git a/Technikladen/Receipt.java b/Technikladen/Receipt.java
new file mode 100755
index 0000000..95ddeb5
--- /dev/null
+++ b/Technikladen/Receipt.java
@@ -0,0 +1,12 @@
+public class Receipt {
+	private Order receiptOrder;
+	private Client receiptClient;
+	public Receipt(Order order, Client client) {
+		this.receiptOrder = order;
+		this.receiptClient = client;
+	}
+	public void printReceipt() {
+		System.out.println("Client:\n" + this.receiptClient.toString());
+		System.out.println(this.receiptOrder.createReceipt());
+	}
+}
diff --git a/Technikladen/StorageManager.java b/Technikladen/StorageManager.java
new file mode 100755
index 0000000..1229c13
--- /dev/null
+++ b/Technikladen/StorageManager.java
@@ -0,0 +1,25 @@
+import java.util.ArrayList;
+
+public class StorageManager {
+	private ArrayList<Product> storageProducts;
+	public StorageManager() {
+		this.storageProducts = new ArrayList<Product>();
+	}
+	public void addProduct(Product product) {
+		this.storageProducts.add(product);
+	}
+	public ArrayList<Product> getStorage() {
+		return this.storageProducts;
+	}
+	public void increaseStorage(int id, int amt) {
+		this.getProductByID(id).increaseAmount(amt);		
+	}
+	public Product getProductByID(int id) {
+		for (Product product : this.storageProducts) {
+			if (product.getID() == id) {
+				return product;
+			}
+		}
+		return new Product(-1, "", 0, 0);
+	}
+}
diff --git a/Technikladen/TechStore.java b/Technikladen/TechStore.java
new file mode 100755
index 0000000..18d4e14
--- /dev/null
+++ b/Technikladen/TechStore.java
@@ -0,0 +1,108 @@
+import java.util.Scanner;
+import java.util.ArrayList;
+
+public class TechStore {
+	public static void p(String input) {
+		System.out.print(input);
+	}
+	public static void main(String[] args) {
+		StorageManager manager = new StorageManager();
+		OrderSystem system = new OrderSystem(manager);
+		Scanner scnr = new Scanner(System.in);
+		while (true) {
+			p("\nInput mode: ");
+			String input = scnr.nextLine();
+			if (input.equals("8")) {
+				break;
+			}
+			switch (Integer.parseInt(input)) {
+			case 1: {
+				p("Name: ");
+				String name = scnr.nextLine();
+				p("E-Mail: ");
+				String email = scnr.nextLine();
+				system.addClient(new Client(name, email));
+				break;
+			}
+			case 2: {
+				ArrayList<Client> clients = system.getClients();
+				if (clients.isEmpty()) {
+					System.out.println("No clients found");
+					break;
+				}
+				for (Client client : clients) {
+					System.out.println(client.toString());
+				}
+				break;
+			}
+			case 3: {
+				p("ID: ");
+				int id = Integer.parseInt(scnr.nextLine());
+				p("Name: ");
+				String name = scnr.nextLine();
+				p("Price: ");
+				int price = Integer.parseInt(scnr.nextLine());
+				p("Amount: ");
+				int amt = Integer.parseInt(scnr.nextLine());
+				system.addProduct(new Product(id, name, price, amt));
+				break;
+			}
+			case 4: {
+				system.showProducts();
+				break;
+			}
+			case 5: {
+				system.showProducts();
+				p("ID: ");
+				int id = Integer.parseInt(scnr.nextLine());
+				p("Amount: ");
+				int amt = Integer.parseInt(scnr.nextLine());
+				manager.increaseStorage(id, amt);
+				break;
+			}
+			case 6: {
+				system.showClients();
+				p("ID: ");
+				int clientID = Integer.parseInt(scnr.nextLine());
+				p("Date: ");
+				String date = scnr.nextLine();
+				Order order = new Order(clientID, date);
+				system.showProducts();
+				while (true) {
+					p("ID: ");
+					String id_str = scnr.nextLine();
+					if (id_str.equals("exit")) {
+						break;
+					}
+					int id = Integer.parseInt(id_str);
+					p("Amount: ");
+					int amt = Integer.parseInt(scnr.nextLine());
+					if (manager.getProductByID(id).getAmount() < amt) {
+						System.out.println("Amount chosen too high");
+						continue;
+					}
+					order.addEntry(new OrderEntry(system.getProductByID(id), amt));
+				}
+				system.createOrder(clientID, order);
+				break;
+			}
+			case 7: {
+				system.showClients();
+				p("ID: ");
+				int id = Integer.parseInt(scnr.nextLine());
+				int n = 0;
+				for (Order order : system.getClientByID(id).getOrders()) {
+					System.out.println((n++) + order.toString());
+				}
+				p("ID: ");
+				int order_id = Integer.parseInt(scnr.nextLine());
+				System.out.println(system.getClientByID(id).getOrders().get(order_id).createReceipt());
+				break;
+			}
+			case 8: {
+				return;
+			}
+			}
+		}
+	}
+}