Added test classes for CardLayout and GameBoard.java

src/GameBoard.java

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+public class GameBoard {
+
+}

src/LocalGamePanel.java

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+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class LocalGamePanel extends JPanel {
+
+    public LocalGamePanel(MainFrame frame) {
+        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
+
+        JLabel label = new JLabel("Lokales Spiel");
+        JButton backButton = new JButton("Zurück zum Hauptmenü");
+        backButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                frame.showPanel("MainMenu");
+            }
+        });
+
+        add(label);
+        add(Box.createVerticalStrut(20));
+        add(backButton);
+    }
+}

src/MainFrame.java

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+import javax.swing.*;
+import java.awt.*;
+
+public class MainFrame extends JFrame {
+
+    private CardLayout cardLayout;
+    private JPanel mainPanel;
+
+    public MainFrame() {
+        setTitle("Spiel UI mit CardLayout");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setSize(800, 600);
+
+        // Erstelle das CardLayout und das Hauptpanel
+        cardLayout = new CardLayout();
+        mainPanel = new JPanel(cardLayout);
+
+        // Erstelle die verschiedenen Panels
+        MainMenuPanel mainMenuPanel = new MainMenuPanel(this);
+        LocalGamePanel localGamePanel = new LocalGamePanel(this);
+        MultiplayerGamePanel multiplayerGamePanel = new MultiplayerGamePanel(this);
+
+        // Füge die Panels dem CardLayout hinzu
+        mainPanel.add(mainMenuPanel, "MainMenu");
+        mainPanel.add(localGamePanel, "LocalGame");
+        mainPanel.add(multiplayerGamePanel, "MultiplayerGame");
+
+        // Setze das Hauptpanel in das JFrame
+        add(mainPanel);
+
+        // Zeige das Hauptmenü an
+        cardLayout.show(mainPanel, "MainMenu");
+    }
+
+    // Methode, um die Ansicht zu wechseln
+    public void showPanel(String panelName) {
+        cardLayout.show(mainPanel, panelName);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            MainFrame frame = new MainFrame();
+            frame.setVisible(true);
+        });
+    }
+}

src/MainMenuPanel.java

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+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class MainMenuPanel extends JPanel {
+
+    public MainMenuPanel(MainFrame frame) {
+        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
+
+        // Button für "Lokales Spiel Starten"
+        JButton localGameButton = new JButton("Lokales Spiel Starten");
+        localGameButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                frame.showPanel("LocalGame");
+            }
+        });
+
+        // Button für "Multiplayer Spiel Starten"
+        JButton multiplayerButton = new JButton("Multiplayer Spiel Starten");
+        multiplayerButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                frame.showPanel("MultiplayerGame");
+            }
+        });
+
+        add(localGameButton);
+        add(Box.createVerticalStrut(20)); // Abstand zwischen den Buttons
+        add(multiplayerButton);
+    }
+}

src/MultiplayerGamePanel.java

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+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class MultiplayerGamePanel extends JPanel {
+
+    public MultiplayerGamePanel(MainFrame frame) {
+        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
+
+        JLabel label = new JLabel("Multiplayer Spiel");
+        JButton backButton = new JButton("Zurück zum Hauptmenü");
+        backButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                frame.showPanel("MainMenu");
+            }
+        });
+
+        add(label);
+        add(Box.createVerticalStrut(20));
+        add(backButton);
+    }
+}