diff --git a/src/main/java/com/example/SubActor.java b/src/main/java/com/example/SubActor.java
new file mode 100644
index 0000000..97594ad
--- /dev/null
+++ b/src/main/java/com/example/SubActor.java
@@ -0,0 +1,218 @@
+package com.example;
+
+import akka.actor.typed.ActorRef;
+import akka.actor.typed.Behavior;
+import akka.actor.typed.javadsl.*;
+
+import java.time.Duration;
+import java.util.Objects;
+
+public class SubActor extends AbstractBehavior<SubActor.Message> {
+
+
+    //Timer, um bei den Berechnungen eine Sekunde lang zu warten
+    TimerScheduler<Message> timer;
+
+    Expression expression;
+
+    //Zeichen für die Operation (Add, Sub, Mul) welche benutzt wird
+    String operationString;
+
+    //Referenz auf den initialen Actor
+    ActorRef<Actor.Message> initial;
+
+    //Referenz auf den (potenziellen) OberSubActor. Es ist immer entweder initial oder oberActor null.
+    ActorRef<SubActor.Message> oberActor;
+
+    //Linke Seite: true, Rechte Seite: false um zu wissen welche Seite des Ausdrucks berechnet wird.
+    boolean side;
+
+    //Zurückgegebener String & Integer von der linken Seite
+    String leftString;
+    int leftInt;
+
+    //Zurückgegebener String & Integer von der rechten Seite
+    String rightString;
+    int rightInt;
+
+    public interface Message {}
+
+    //Message kommt von dem initialen Actor
+    public record PrintAndEvaluate(ActorRef<Actor.Message> sender,Expression expression, Boolean side) implements Message{ }
+
+    //Message kommt von einem anderen SubActor
+    public record SubPrintAndEvaluate(ActorRef<SubActor.Message> sender,Expression expression, Boolean side) implements Message{ }
+
+    //Antwort von dem linken Kind
+    public record LeftResponse(String string, int wert) implements Message{ }
+
+    //Antwort von dem rechten Kind
+    public record RightResponse(String string, int wert) implements Message{ }
+
+    //Nachricht an sich selbst, um nach einer Sekunde Wartezeit das Ergebnis zu berechnen
+    public record Compute() implements Message{}
+
+    private SubActor(ActorContext<SubActor.Message> context, TimerScheduler<Message> timer){
+        super(context);
+        this.timer = timer;
+    }
+
+    public static Behavior<SubActor.Message> create(){
+        return Behaviors.setup(context -> Behaviors.withTimers(timers ->  new SubActor(context,timers)));
+    }
+
+    @Override
+    public Receive<SubActor.Message> createReceive(){
+        return newReceiveBuilder()
+                .onMessage(PrintAndEvaluate.class, this::onPrintAndEvaluate)
+                .onMessage(SubPrintAndEvaluate.class, this::onSubPrintAndEvaluate)
+                .onMessage(LeftResponse.class, this::onLeftResponse)
+                .onMessage(RightResponse.class, this::onRightResponse)
+                .onMessage(Compute.class, this::onComputeMessage)
+                .build();
+    }
+
+    //Die Nachricht von dem initialen Actor wird verarbeitet.
+    //Dabei wird seine Referenz in @initial gespeichert
+    public Behavior<Message> onPrintAndEvaluate(PrintAndEvaluate message) {
+        this.initial = message.sender;
+        this.expression = message.expression;
+        this.side = message.side;
+        //Wenn initial nur Val übergeben wird → einfach ausgeben ansonsten UnterActors erstellen
+        if (Objects.requireNonNull(expression) instanceof Expression.Add add) {
+            this.operationString = "+";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(), add.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(), add.right(), false));
+        } else if (expression instanceof Expression.Sub sub) {
+            this.operationString = "-";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.right(), false));
+        } else if (expression instanceof Expression.Mul mul) {
+            this.operationString = "*";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.right(), false));
+        } else if (expression instanceof Expression.Val val) {
+            if(side == true){
+                initial.tell(new Actor.LeftResponse(String.valueOf(val.inner()), val.inner()));
+            }else{
+                initial.tell(new Actor.RightResponse(String.valueOf(val.inner()), val.inner()));
+            }
+        }
+        return this;
+    }
+
+        //Nachricht von dem SubActor, von welchem dieser SubActor erstellt wurde, wird verarbeitet.
+        //Dabei wird seine Referenz in oberActor gespeichert.
+        public Behavior<Message> onSubPrintAndEvaluate(SubPrintAndEvaluate message){
+            this.oberActor = message.sender;
+            this.expression = message.expression;
+            this.side = message.side;
+            //Wenn initial nur Val übergeben wird → einfach ausgeben ansonsten UnterActors erstellen
+            if (Objects.requireNonNull(expression) instanceof Expression.Add add) {
+                this.operationString = "+";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),add.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),add.right(), false));
+            }
+            else if (expression instanceof Expression.Sub sub) {
+                this.operationString = "-";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.right(), false));
+            }
+            else if (expression instanceof Expression.Mul mul) {
+                this.operationString = "*";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.right(), false));
+            } else if (expression instanceof Expression.Val val) {
+                if(side == true){
+                    oberActor.tell(new SubActor.LeftResponse(String.valueOf(val.inner()), val.inner()));
+                }else{
+                    oberActor.tell(new SubActor.RightResponse(String.valueOf(val.inner()), val.inner()));
+                }
+            }
+            return this;
+    }
+
+    public Behavior<Message> onLeftResponse(LeftResponse response){
+        this.leftString = response.string;
+        this.leftInt = response.wert;
+        if(this.rightString != null){
+            timer.startSingleTimer(new Compute(), Duration.ofSeconds(1));
+        }
+        return this;
+    }
+
+    public Behavior<Message> onRightResponse(RightResponse response){
+        this.rightString = response.string;
+        this.rightInt = response.wert;
+        if(this.leftString != null){
+            timer.startSingleTimer(new Compute(), Duration.ofSeconds(1));
+        }
+        return this;
+    }
+
+    private Behavior<Message> onComputeMessage(Compute response) {
+        if (oberActor != null) {
+            //side == true bedeutet, dass dieser Actor das linke Kind ist und es wird LeftResponse geschickt
+            if (side == true) {
+                if (operationString.equals("+")) {
+                    oberActor.tell(new LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt + rightInt));
+                } else if (operationString.equals("-")) {
+                    oberActor.tell(new LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt - rightInt));
+                } else {
+                    oberActor.tell(new LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt * rightInt));
+                }
+            } else {
+                if (operationString.equals("+")) {
+                    oberActor.tell(new RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt + rightInt));
+                } else if (operationString.equals("-")) {
+                    oberActor.tell(new RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt - rightInt));
+                } else {
+                    oberActor.tell(new RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt * rightInt));
+                }
+            }
+        } else {
+            if (side == true) {
+                if (operationString.equals("+")) {
+                    initial.tell(new Actor.LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt + rightInt));
+                } else if (operationString.equals("-")) {
+                    initial.tell(new Actor.LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt - rightInt));
+                } else {
+                    initial.tell(new Actor.LeftResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt * rightInt));
+                }
+            } else {
+                if (operationString.equals("+")) {
+                    initial.tell(new Actor.RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt + rightInt));
+                } else if (operationString.equals("-")) {
+                    initial.tell(new Actor.RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt - rightInt));
+                } else {
+                    initial.tell(new Actor.RightResponse("(" + leftString + operationString + rightString + ")",
+                            leftInt * rightInt));
+                }
+            }
+        }
+        return this;
+    }
+}