Doc DONE

src/main/java/com/example/AddressBook.java

@@ -12,16 +12,26 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Random;
 
+/**
+ * AddressBook Actor class that maintains a list of customers and handles messages related to customer addresses.
+ * This actor can respond to requests for customer addresses and can provide the list of all customers.
+ */
 public class AddressBook extends AbstractBehavior<AddressBook.Message> {
+
     private final ArrayList<ActorRef<Customer.Message>> customers;
 
+    /**
+     * Interface for all messages that AddressBook can handle.
+     */
     public interface Message {}
 
-    // Nachricht, wenn ein Empfänger nach einer Adresse fragt
+    /**
+     * Message sent by a customer asking for a random address from the AddressBook.
+     */
     public static final class CustomerMessage implements Message {
-        public final ActorRef<Customer.Message> fragender;
-        public final String nameFragender;
-        public final ActorRef<DeliveryCar.Message> truckReference;
+        public final ActorRef<Customer.Message> fragender;  // The customer actor sending the message
+        public final String nameFragender;  // The name of the customer
+        public final ActorRef<DeliveryCar.Message> truckReference;  // Reference to the delivery car
 
         public CustomerMessage(ActorRef<Customer.Message> fragender, String nameFragender, ActorRef<DeliveryCar.Message> truckReference) {
             this.fragender = fragender;
@@ -30,23 +40,39 @@ public class AddressBook extends AbstractBehavior<AddressBook.Message> {
         }
     }
 
-    // Nachricht, um die Liste der Kunden abzurufen
+    /**
+     * Message to request the list of all customers.
+     */
     public static final class GetCustomers implements Message {
-        public final ActorRef<List<ActorRef<Customer.Message>>> replyTo;
+        public final ActorRef<List<ActorRef<Customer.Message>>> replyTo;  // Actor to reply to with the list of customers
 
         public GetCustomers(ActorRef<List<ActorRef<Customer.Message>>> replyTo) {
             this.replyTo = replyTo;
         }
     }
 
+    /**
+     * Constructor for AddressBook.
+     * Initializes the AddressBook with a list of customer actors and sends each customer an AddressHello message.
+     *
+     * @param context the actor context
+     * @param customers the list of customer actors
+     */
     private AddressBook(ActorContext<Message> context, ArrayList<ActorRef<Customer.Message>> customers) {
         super(context);
         this.customers = new ArrayList<>(customers);
+        // Notify each customer with an AddressHello message
         for (ActorRef<Customer.Message> cst : this.customers) {
             cst.tell(new Customer.AddressHello(getContext().getSelf()));
         }
     }
 
+    /**
+     * Factory method to create a new AddressBook actor.
+     *
+     * @param customers the list of customer actors
+     * @return the behavior of the AddressBook actor
+     */
     public static Behavior<Message> create(ArrayList<ActorRef<Customer.Message>> customers) {
         return Behaviors.setup(context -> new AddressBook(context, customers));
     }
@@ -59,19 +85,29 @@ public class AddressBook extends AbstractBehavior<AddressBook.Message> {
                 .build();
     }
 
-    // Methode, um einen zufälligen Empfänger auszugeben
+    /**
+     * Handles CustomerMessage by selecting a random customer from the list and sending their address to the requesting customer.
+     *
+     * @param msg the customer message requesting a random address
+     * @return the behavior of the AddressBook actor
+     */
     private Behavior<Message> onCustomerMessage(CustomerMessage msg) {
         Random random = new Random();
         int index = random.nextInt(customers.size());
         ActorRef<Customer.Message> addressOf = customers.get(index);
-        getContext().getLog().info("{} hat nach einer Addresse gefragt CAR: {} ", msg.nameFragender, msg.truckReference.path().name());
+        getContext().getLog().info("{} hat nach einer Adresse gefragt CAR: {}", msg.nameFragender, msg.truckReference.path().name());
         msg.fragender.tell(new Customer.AddressMessage(addressOf, msg.truckReference));
         return this;
     }
 
-    // Methode, um die Liste der Kunden zu senden
+    /**
+     * Handles GetCustomers message by replying with the unmodifiable list of customers.
+     *
+     * @param msg the get customers message
+     * @return the behavior of the AddressBook actor
+     */
     private Behavior<Message> onGetCustomers(GetCustomers msg) {
         msg.replyTo.tell(Collections.unmodifiableList(customers));
         return this;
     }
-}
+}

src/main/java/com/example/AkkaMainSystem.java

@@ -5,45 +5,75 @@ import akka.actor.typed.Behavior;
 import akka.actor.typed.javadsl.*;
 
 import java.util.ArrayList;
-import java.util.List;
 
+
+/**
+ * AkkaMainSystem Actor class that initializes the system with customers, an address book, and a distribution center.
+ */
 public class AkkaMainSystem extends AbstractBehavior<AkkaMainSystem.Create> {
 
+    /**
+     * Message to trigger the creation of the AkkaMainSystem.
+     */
     public static class Create {}
 
+    /**
+     * Factory method to create a new AkkaMainSystem actor.
+     *
+     * @return the behavior of the AkkaMainSystem actor
+     */
     public static Behavior<Create> create() {
         return Behaviors.setup(AkkaMainSystem::new);
     }
 
-    // Statische Referenz auf das DistributionCenter
+    // Static reference to the DistributionCenter actor
     private static ActorRef<DistributionCenter.Message> distributionCenter;
 
-    // Statische Methode zum Abrufen der DistributionCenter-Referenz
+    /**
+     * Static method to retrieve the reference of the DistributionCenter actor.
+     *
+     * @return the DistributionCenter actor reference
+     */
     public static ActorRef<DistributionCenter.Message> getDistributionCenter() {
         return distributionCenter;
     }
 
+    /**
+     * Constructor for AkkaMainSystem.
+     * Initializes the system by creating customers, an address book, and a distribution center.
+     *
+     * @param context the actor context
+     */
     private AkkaMainSystem(ActorContext<Create> context) {
         super(context);
 
-        // Erstellen des Adressbuchs
+        // Creating the list of customer actors
         ArrayList<ActorRef<Customer.Message>> customers = new ArrayList<>();
         customers.add(getContext().spawn(Customer.create("Alice"), "alice"));
         customers.add(getContext().spawn(Customer.create("Bob"), "bob"));
         customers.add(getContext().spawn(Customer.create("Charles"), "charles"));
         customers.add(getContext().spawn(Customer.create("Derick"), "derick"));
+
+        // Creating the AddressBook actor with the list of customers
         ActorRef<AddressBook.Message> addressBook = getContext().spawn(AddressBook.create(customers), "addressBook");
 
-        // Erstellen des Verteilzentrums
+        // Creating the DistributionCenter actor with the address book reference
         distributionCenter = getContext().spawn(DistributionCenter.create(addressBook), "distributionCenter");
-
     }
 
     @Override
     public Receive<Create> createReceive() {
-        return newReceiveBuilder().onMessage(Create.class, this::onCreate).build();
+        return newReceiveBuilder()
+                .onMessage(Create.class, this::onCreate)
+                .build();
     }
 
+    /**
+     * Handles the Create message. Additional setup can be done here if needed.
+     *
+     * @param command the create command
+     * @return the behavior of the AkkaMainSystem actor
+     */
     private Behavior<Create> onCreate(Create command) {
         // Additional setup if needed
         return this;

src/main/java/com/example/Customer.java

@@ -11,15 +11,24 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Random;
 
+/**
+ * Customer Actor class that simulates a customer in the system.
+ * This actor can receive packages, send packages, and interact with an address book.
+ */
 public class Customer extends AbstractBehavior<Customer.Message> {
 
     String name;
     ActorRef<AddressBook.Message> adrBook;
     ArrayList<String> gegenstaende = new ArrayList<>(Arrays.asList("Spülmaschine","Altes CD-Regal", "Goldbarren","20kg Hanteln", "Holzkohlegrill","Blumenerde"));
 
+    /**
+     * Interface for all messages that Customer can handle.
+     */
     public interface Message {}
 
-    //Delivery Nachricht Typ
+    /**
+     * Message representing a delivery of a package to the customer.
+     */
     public static final class DeliveryMessage implements Message {
         public final Paket paket;
 
@@ -28,7 +37,9 @@ public class Customer extends AbstractBehavior<Customer.Message> {
         }
     }
 
-    //Pickup Nachricht Typ
+    /**
+     * Message representing a request to pick up a package from the customer.
+     */
     public static final class PickUpMessage implements Message {
         public final ActorRef<DeliveryCar.Message> truckReference;
         public final String someString;
@@ -42,11 +53,25 @@ public class Customer extends AbstractBehavior<Customer.Message> {
     public record AddressHello(ActorRef<AddressBook.Message> book) implements Message {}
     public record AddressMessage(ActorRef<Customer.Message> addresse, ActorRef<DeliveryCar.Message> truckReference) implements Message {}
 
+    /**
+     * Constructor for Customer.
+     * Initializes the customer with a name.
+     *
+     * @param context the actor context
+     * @param name the name of the customer
+     */
     private Customer(ActorContext<Message> context, String name){
         super(context);
         this.name = name;
     }
 
+
+    /**
+     * Factory method to create a new Customer actor.
+     *
+     * @param name the name of the customer
+     * @return the behavior of the Customer actor
+     */
     public static Behavior<Customer.Message> create(String name) {
         return Behaviors.setup(context -> new Customer(context, name));
     }
@@ -62,15 +87,26 @@ public class Customer extends AbstractBehavior<Customer.Message> {
                 .build();
     }
 
-    //Hier wird das Adressbuch gespeichert, nachdem es sich gemeldet hat
+    /**
+     * Stores the address book reference when received.
+     *
+     * @param msg the AddressHello message
+     * @return the behavior of the Customer actor
+     */
     private Behavior<Message> onAddressHello(AddressHello msg){
         this.adrBook = msg.book;
         return this;
     }
 
-    //Verhalten, wenn Pickup Nachricht eingegangen ist
-    //Wenn 80% getroffen wurden, wird eine Anfrage an das Adressbuch geschickt und die Antwort
-    // an anderer Stelle (onAddressMessage) verarbeitet, um das Paket zu verschicken
+    /**
+     * Handles the PickUpMessage by deciding whether to send a package.
+     * If a random number is less than or equal to 80, a request is sent to the address book
+     * to get a random customer address, and the package is then sent.
+     * Otherwise, logs that no package will be sent.
+     *
+     * @param msg the PickUpMessage
+     * @return the behavior of the Customer actor
+     */
     private Behavior<Message> onPickUpMessage(PickUpMessage msg){
         getContext().getLog().info("Kunde {}, will kein Paket abschicken CAR: {}", this.name, msg.truckReference.path().name());
         Random random = new Random();
@@ -89,7 +125,12 @@ public class Customer extends AbstractBehavior<Customer.Message> {
         return this;
     }
 
-    //Adresse des Empfängers von dem Adressbuch empfangen und das Paket wird in den Truck geladen und verschickt
+    /**
+     * Handles the AddressMessage by creating a package with a random item and sending it to the truck.
+     *
+     * @param adr the AddressMessage
+     * @return the behavior of the Customer actor
+     */
     private Behavior<Message> onAddressMessage(AddressMessage adr){
         Random random = new Random();
         int index = random.nextInt(gegenstaende.size());
@@ -100,7 +141,12 @@ public class Customer extends AbstractBehavior<Customer.Message> {
         return this;
     }
 
-    //Verhalten, wenn Paket eingegangen ist
+    /**
+     * Handles the DeliveryMessage by logging the received package details.
+     *
+     * @param pkt the DeliveryMessage
+     * @return the behavior of the Customer actor
+     */
     private Behavior<Message> onDeliveryMessage(DeliveryMessage pkt){
         getContext().getLog().info("Ich habe ein Paket von {} erhalten mit dem Inhalt: {} ", pkt.paket.absender, pkt.paket.inhalt);
         return this;

src/main/java/com/example/DeliveryCar.java

@@ -10,36 +10,77 @@ import java.util.List;
 
 import static com.example.AkkaMainSystem.getDistributionCenter;
 
+/**
+ * DeliveryCar class that simulates a delivery car in the system.
+ * This actor can load packages, follow a delivery route, and pick up packages from customers.
+ */
 public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
 
+    // Liste der Pakete im Lieferwagen
     private final ArrayList<Paket> pakete = new ArrayList<>();
+    // Route mit Kunden, die abgefahren wird
     private final ArrayList<ActorRef<Customer.Message>> route;
+    // Maximale Kapazität des Lieferwagens
     private final int maxCapacity = 3;
+    // Timer zum Planen von Zustellungen
     private final TimerScheduler<Message> timers;
+    // Globaler Index für die aktuelle Position auf der Route
     private int globalIndex = 0;
 
+    /**
+     * Interface for all messages that DeliveryCar can handle.
+     */
     public interface Message {}
 
+    /**
+     * Message to load packages into the delivery car.
+     */
     public record LoadMessage(List<Paket> pakete) implements Message {}
 
+    /**
+     * Message representing the response from a customer when a package is picked up.
+     */
     public record PickupResponse(Paket paket) implements Message {}
 
+    /**
+     * Message to start the delivery route.
+     */
     public record StartRoute() implements Message {}
 
+    /**
+     * Message to check the next stop on the route.
+     */
     public record CheckStop() implements Message {}
 
-    public record Clear() implements Message {} // Clear all packages in the delivery car
+    /**
+     * Message to clear all packages in the delivery car.
+     */
+    public record Clear() implements Message {}
 
+    /**
+     * Constructor for DeliveryCar.
+     *
+     * @param context the actor context
+     * @param timers the timer scheduler
+     * @param route the delivery route
+     */
     private DeliveryCar(ActorContext<Message> context, TimerScheduler<Message> timers, ArrayList<ActorRef<Customer.Message>> route) {
         super(context);
         this.route = route;
         this.timers = timers;
     }
 
+    /**
+     * Factory method to create a new DeliveryCar actor.
+     *
+     * @param route the delivery route
+     * @return the behavior of the DeliveryCar actor
+     */
     public static Behavior<Message> create(List<ActorRef<Customer.Message>> route) {
         return Behaviors.setup(context -> Behaviors.withTimers(timers -> new DeliveryCar(context, timers, new ArrayList<>(route))));
     }
 
+    // Handling of the various messages the DeliveryCar can receive
     @Override
     public Receive<Message> createReceive() {
         return newReceiveBuilder()
@@ -51,7 +92,12 @@ public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
                 .build();
     }
 
-    //Nachricht, um Pakete zu beladen von DistributionCenter z.B.
+    /**
+     * Handles the LoadMessage to load packages into the delivery car.
+     *
+     * @param msg the LoadMessage
+     * @return the behavior of the DeliveryCar actor
+     */
     private Behavior<Message> onLoadMessage(LoadMessage msg) {
         pakete.addAll(msg.pakete);
         getContext().getLog().info("Laden: {} Pakete wurden in den LKW geladen.", msg.pakete.size());
@@ -59,8 +105,12 @@ public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
         return this;
     }
 
-
-    //Die Nachricht, die den Paket, vom Kunden abholt und in den Wagen lädt
+    /**
+     * Handles the PickupResponse to pick up a package from a customer.
+     *
+     * @param rsp the PickupResponse
+     * @return the behavior of the DeliveryCar actor
+     */
     private Behavior<Message> onPickupResponse(PickupResponse rsp) {
         if (rsp.paket != null && rsp.paket.inhalt != null && pakete.size() < maxCapacity) {
             pakete.add(rsp.paket);
@@ -70,7 +120,13 @@ public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
         return this;
     }
 
-    //Prüft, ob der Wagen schon alle Addressen durchgegangen ist und geht zum Verteilerzentrum, sonst. geht dieser seine Route weiter
+    /**
+     * Checks if the delivery car has completed the route and returns to the distribution center.
+     * Otherwise, it moves to the next stop.
+     *
+     * @param stop the CheckStop message
+     * @return the behavior of the DeliveryCar actor
+     */
     private Behavior<Message> onCheckStop(CheckStop stop) {
         if (globalIndex >= route.size()) {
             getContext().getLog().info("Rückkehr: Der LKW kehrt zum Verteilzentrum zurück mit {} Paketen.", pakete.size());
@@ -90,26 +146,43 @@ public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
         return this;
     }
 
-    //Methode, um die Autos zu "starten"
+    /**
+     * Starts the delivery route.
+     *
+     * @param msg the StartRoute message
+     * @return the behavior of the DeliveryCar actor
+     */
     private Behavior<Message> onStartRoute(StartRoute msg) {
         globalIndex = 0;
         scheduleNextStopCheck(Duration.ofSeconds(3)); // Start checking the first stop after 3 seconds
         return this;
     }
 
-    //
+    /**
+     * Clears all packages in the delivery car.
+     *
+     * @param clear the Clear message
+     * @return the behavior of the DeliveryCar actor
+     */
     private Behavior<Message> onClear(Clear clear) {
         pakete.clear();
         return this;
     }
 
-    //Sendet eine Nachricht an Customer bzw. an einen Addressaten, wo der Wagen steht, und fragt ob ein Paket von denen geliefert werden soll
+    /**
+     * Sends a pickup message to a customer to ask if they have a package to send.
+     *
+     * @param customer the customer actor reference
+     */
     private void sendPickupMessage(ActorRef<Customer.Message> customer) {
         customer.tell(new Customer.PickUpMessage(getContext().getSelf(), "Der LKW kann das Paket abholen."));
     }
 
-
-    //Liefert Paket aus, die im Wagen ist
+    /**
+     * Delivers packages that are meant for the current customer.
+     *
+     * @param customer the customer actor reference
+     */
     private void deliverPackages(ActorRef<Customer.Message> customer) {
         pakete.removeIf(paket -> {
             if (paket.empfaenger.equals(customer)) {
@@ -120,7 +193,11 @@ public class DeliveryCar extends AbstractBehavior<DeliveryCar.Message> {
         });
     }
 
-    //Private Methode für den Timer
+    /**
+     * Schedules the next stop check after a given duration.
+     *
+     * @param duration the duration after which to check the next stop
+     */
     private void scheduleNextStopCheck(Duration duration) {
         timers.startSingleTimer(new CheckStop(), duration);
     }

src/main/java/com/example/DistributionCenter.java

@@ -11,14 +11,27 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+/**
+ * Die Klasse `DistributionCenter` repräsentiert das Verteilzentrum im System.
+ * Das Verteilzentrum empfängt Pakete von Lieferwagen, speichert sie und generiert Routen für Lieferwagen.
+ */
 public class DistributionCenter extends AbstractBehavior<DistributionCenter.Message> {
-
+    // Referenz auf das Adressbuch
     private final ActorRef<AddressBook.Message> addressBook;
-    public static class StartAllRoutes implements Message {}
-
+    // Liste der Pakete im Lager
     private final List<Paket> lagerraum = new ArrayList<>();
+    // Liste der Lieferwagen
     private final List<ActorRef<DeliveryCar.Message>> deliveryCars = new ArrayList<>();
 
+    public static class StartAllRoutes implements Message {}
+
+
+    /**
+     * Konstruktor für das Verteilzentrum.
+     *
+     * @param context das Actor-Kontext
+     * @param addressBook Referenz auf das Adressbuch
+     */
     private DistributionCenter(ActorContext<Message> context, ActorRef<AddressBook.Message> addressBook) {
         super(context);
         this.addressBook = addressBook;
@@ -40,12 +53,21 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
         addressBook.tell(new AddressBook.GetCustomers(replyTo));
     }
 
+    /**
+     * Factory-Methode zur Erstellung eines neuen Verteilzentrums-Akteurs.
+     *
+     * @param addressBook Referenz auf das Adressbuch
+     * @return das Verhalten des Verteilzentrums-Akteurs
+     */
     public static Behavior<Message> create(ActorRef<AddressBook.Message> addressBook) {
         return Behaviors.setup(context -> new DistributionCenter(context, addressBook));
     }
-
+    // Definition der Nachrichten für das Verteilzentrum
     interface Message {}
 
+    /**
+     * Nachricht, die ankommende Pakete vom Lieferwagen enthält.
+     */
     public static class ArriveMessage implements Message {
         private final List<Paket> pakete;
         private final ActorRef<DeliveryCar.Message> truck;
@@ -64,6 +86,9 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
         }
     }
 
+    /**
+     * Nachricht zur Generierung von Routen für Lieferwagen.
+     */
     public static class GenerateRoutes implements Message {
         private final List<ActorRef<Customer.Message>> customers;
 
@@ -85,6 +110,12 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
                 .build();
     }
 
+    /**
+     * Handhabt die Ankunftsnachricht vom Lieferwagen.
+     *
+     * @param msg die Ankunftsnachricht
+     * @return das Verhalten des Verteilzentrums
+     */
     private Behavior<Message> onArriveMessage(ArriveMessage msg) {
         // Füge alle Pakete aus der Ankunftsnachricht dem Lagerraum hinzu
         List<Paket> arrivedPackages = msg.getPakete();
@@ -106,12 +137,23 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
         return this;
     }
 
+    /**
+     * Handhabt die Nachricht zur Generierung von Routen.
+     *
+     * @param msg die Nachricht zur Generierung von Routen
+     * @return das Verhalten des Verteilzentrums
+     */
     private Behavior<Message> onGenerateRoutes(GenerateRoutes msg) {
         List<ActorRef<Customer.Message>> customers = msg.getCustomers();
         generateRoutes(customers);
         return this;
     }
 
+    /**
+     * Generiert Routen für Lieferwagen.
+     *
+     * @param customers die Liste der Kunden
+     */
     private void generateRoutes(List<ActorRef<Customer.Message>> customers) {
         if (customers == null || customers.isEmpty()) {
             getContext().getLog().info("Kundenliste ist leer oder null. Keine Routen generiert.");
@@ -135,6 +177,12 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
         }
     }
 
+    /**
+     * Startet alle Routen für die Lieferwagen.
+     *
+     * @param msg die Nachricht zum Starten aller Routen
+     * @return das Verhalten des Verteilzentrums
+     */
     private Behavior<Message> onStartAllRoutes(StartAllRoutes msg) {
         for (ActorRef<DeliveryCar.Message> deliveryCar : deliveryCars) {
             deliveryCar.tell(new DeliveryCar.StartRoute());
@@ -142,6 +190,12 @@ public class DistributionCenter extends AbstractBehavior<DistributionCenter.Mess
         return this;
     }
 
+    /**
+     * Generiert eine zufällige Route aus einer Liste von Kunden.
+     *
+     * @param customers die Liste der Kunden
+     * @return eine zufällige Route
+     */
     private List<ActorRef<Customer.Message>> generateRandomRoute(List<ActorRef<Customer.Message>> customers) {
         List<ActorRef<Customer.Message>> route = new ArrayList<>(customers);
         Collections.shuffle(route);

src/main/java/com/example/Paket.java

@@ -2,20 +2,36 @@ package com.example;
 
 import akka.actor.typed.ActorRef;
 
-
+/**
+ * Paket class that represents a package in the system.
+ */
 public class Paket {
+    // Inhalt des Pakets
     String inhalt;
+    // Absender des Pakets
     String absender;
+    // Empfänger des Pakets
     ActorRef<Customer.Message> empfaenger;
 
-    // Konstruktor, der nur den Inhalt annimmt
+    /**
+     * Constructor that initializes a package with only the content.
+     * The sender and recipient are optional and can be set later.
+     *
+     * @param inhalt the content of the package
+     */
     Paket(String inhalt) {
         this.inhalt = inhalt;
-        this.absender = null; // Absender und Empfänger können optional sein
-        this.empfaenger = null;
+        this.absender = null; // Absender ist optional
+        this.empfaenger = null; // Empfänger ist optional
     }
 
-    // Konstruktor mit allen Parametern
+    /**
+     * Constructor that initializes a package with content, sender, and recipient.
+     *
+     * @param inhalt the content of the package
+     * @param absender the sender of the package
+     * @param empfaenger the recipient of the package
+     */
     Paket(String inhalt, String absender, ActorRef<Customer.Message> empfaenger) {
         this.inhalt = inhalt;
         this.absender = absender;