ist mal n Anfang

wenn du das Programm über Start.java startest, erscheint die View + 
Dialog zum Auswählen, es passiert aber noch nix

src/ChatProgramm/controller/CommandController.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller;
+
+import ChatProgramm.controller.commands.CommandConnect;
+import ChatProgramm.controller.commands.CommandInvoker;
+import ChatProgramm.controller.commands.CommandSend;
+import ChatProgramm.model.Transmitter;
+import ChatProgramm.view.ChatView;
+import java.awt.Component;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+/**
+ *
+ * @author ahren
+ */
+public class CommandController implements ActionListener{
+    
+    private ChatView view;
+    private Transmitter transmitter;
+    private CommandInvoker invoker;
+    
+    public CommandController(ChatView view, Transmitter transmitter){
+        this.view = view;
+        this.transmitter = transmitter;
+        this.invoker = new CommandInvoker();
+    }
+    
+    public void registerEvents(){
+        view.getBtnConnect().addActionListener(this); 
+        view.getTfNachricht().addActionListener(this);
+    }
+    
+    public void registerCommands(){
+        invoker.addCommand(view.getBtnConnect(), new CommandConnect());
+        invoker.addCommand(view.getTfNachricht(), new CommandSend());
+    }
+
+    /**
+     * Ausführen des jeweiligen Kommandos
+     * @param e Referenz auf das Event
+     */
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        Component key = (Component)e.getSource();
+        invoker.executeCommand(key);
+//        if(key == view.getBtnOpen()|| key==view.getMiOpen())
+//          invoker.deleteStack();
+//        }
+    }
+    
+}
+
+

src/ChatProgramm/controller/Nachricht.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller;
+
+/**
+ *
+ * @author ahren
+ */
+class Nachricht 
+{
+  public Nachricht()
+  {
+  
+  }
+}

src/ChatProgramm/controller/ReceiveAdapter.java

@@ -0,0 +1,41 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller;
+
+import java.util.concurrent.Flow;
+import java.util.concurrent.Flow.Subscriber;
+
+/**
+ *
+ * @author ahren
+ */
+public class ReceiveAdapter implements Subscriber<Nachricht>
+{
+  public ReceiveAdapter()
+  {
+  
+  }
+
+  @Override
+  public void onSubscribe(Flow.Subscription subscription)
+  {
+  }
+
+  @Override
+  public void onNext(Nachricht item)
+  {
+  }
+
+  @Override
+  public void onError(Throwable throwable)
+  {
+  }
+
+  @Override
+  public void onComplete()
+  {
+  }
+}

src/ChatProgramm/controller/commands/CommandConnect.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller.commands;
+
+/**
+ *
+ * @author ahren
+ */
+public class CommandConnect implements CommandInterface
+{
+  public CommandConnect()
+  {
+  
+  }
+
+  @Override
+  public void execute()
+  {
+  }
+
+  @Override
+  public boolean isUndoable()
+  {
+    return false;
+  }
+
+  @Override
+  public void undo()
+  {
+  }
+}

src/ChatProgramm/controller/commands/CommandInterface.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller.commands;
+
+/**
+ *
+ * @author ahren
+ */
+public interface CommandInterface
+{
+  public void execute();
+  public void undo();
+//  public void redo();
+  public boolean isUndoable();
+}

src/ChatProgramm/controller/commands/CommandInvoker.java

@@ -0,0 +1,69 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller.commands;
+
+import java.awt.Component;
+import java.util.HashMap;
+import java.util.Stack;
+
+/**
+ *
+ * @author ahren
+ */
+public class CommandInvoker {
+    
+    private HashMap<Component, CommandInterface> commands;
+    private Stack <CommandInterface> undoStack;
+    
+    public CommandInvoker(){
+        commands = new HashMap<>();
+        undoStack = new Stack();  
+    }
+    
+    /**
+    * Fügt ein Kommando zur Kommando-"Datenbank" = HashMap hinzu
+    * @param key Quelle des Events
+    * @param value Referenz auf das zugehörige Kommando-Objekt
+    */
+    public void addCommand(Component key, CommandInterface value){
+        commands.put(key, value);
+    }
+    
+    /**
+    * Führt Kommando der Eventquelle "key" aus und legt die Referenz
+    * des Kommando in den Undo-Stack
+    * @param key Referenz auf die Eventquelle
+    */
+    public void executeCommand(Component key){
+      CommandInterface command = commands.get(key);
+      command.execute();
+      if (command.isUndoable())
+      {
+        undoStack.push(command);
+      }
+    }
+    /**
+    * Falls der Stack Elemente enthält, wird das oberste Element geholt
+    * und die Methode "undo" des Commands aufgerufen
+    */
+    public void undoCommand()
+    {
+      if (!undoStack.isEmpty())
+      {
+        undoStack.pop().undo();
+      }
+    }
+
+    /**
+     * Löscht bei Öffnen einer neuen Datei den Stack
+     */
+    public void deleteStack()
+    {
+      while(!undoStack.isEmpty())
+        undoStack.pop();
+    }
+    
+}

src/ChatProgramm/controller/commands/CommandSend.java

@@ -0,0 +1,34 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package ChatProgramm.controller.commands;
+
+/**
+ *
+ * @author ahren
+ */
+public class CommandSend implements CommandInterface
+{
+  public CommandSend()
+  {
+  
+  }
+
+  @Override
+  public void execute()
+  {
+  }
+
+  @Override
+  public boolean isUndoable()
+  {
+    return false;
+  }
+
+  @Override
+  public void undo()
+  {
+  }
+}