EDIT: Smaller changes to enable key bindings in the game statistics UI.

src/main/java/carcassonne/control/MainController.java

@@ -33,6 +33,7 @@ public class MainController {
     private final Map<Class<? extends AbstractControllerState>, AbstractControllerState> stateMap;
     private AbstractControllerState currentState;
     private final GameSettings settings;
+    private final GlobalKeyBindingManager keyBindings;
 
     /**
      * Basic constructor. Creates the view and the model of the game.
@@ -43,7 +44,7 @@ public MainController() {
         mainGUI = new MainGUI(this);
         rotationGUI = new RotationGUI(this, mainGUI);
         placementGUI = new PlacementGUI(this, mainGUI);
-        GlobalKeyBindingManager keyBindings = new GlobalKeyBindingManager(this, mainGUI, rotationGUI);
+        keyBindings = new GlobalKeyBindingManager(this, mainGUI, rotationGUI);
         mainGUI.addKeyBindings(keyBindings);
         rotationGUI.addKeyBindings(keyBindings);
         placementGUI.addKeyBindings(keyBindings);
@@ -138,6 +139,14 @@ public void updateStates(Round newRound, Grid newGrid) {
         }
     }
 
+    /**
+     * Getter for the global key binding manager.
+     * @return the global key bindings.
+     */
+    public GlobalKeyBindingManager getKeyBindings() {
+        return keyBindings;
+    }
+
     /**
      * Getter for the {@link GameSettings}, which grants access to the games settings.
      * @return the {@link GameSettings} instance.

src/main/java/carcassonne/control/state/StateGameOver.java

@@ -95,7 +95,8 @@ protected void entry() {
         updateStackSize();
         mainGUI.resetMenuState();
         GameMessage.showMessage(GAME_OVER_MESSAGE + round.getWinningPlayers());
-        gameStatistics = new GameStatisticsGUI(mainGUI, controller, round); // TODO (HIGH) key bindings for this UI?
+        gameStatistics = new GameStatisticsGUI(mainGUI, controller, round);
+        gameStatistics.addKeyBindings(controller.getKeyBindings());
     }
 
     /**

src/main/java/carcassonne/view/main/WindowMaximizationAdapter.java

@@ -1,5 +1,6 @@
 package carcassonne.view.main;
 
+import java.awt.Frame;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 
@@ -28,7 +29,7 @@ public WindowMaximizationAdapter(JFrame frame) {
     public void windowActivated(WindowEvent event) {
         if (!maximized) {
             maximized = true;
-            frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH);
+            frame.setExtendedState(frame.getExtendedState() | Frame.MAXIMIZED_BOTH);
         }
 
     }

src/main/java/carcassonne/view/tertiary/GameStatisticsGUI.java

@@ -6,14 +6,18 @@
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 
+import javax.swing.ActionMap;
+import javax.swing.InputMap;
 import javax.swing.JButton;
+import javax.swing.JComponent;
 import javax.swing.JDialog;
 import javax.swing.JTable;
 import javax.swing.table.JTableHeader;
 import javax.swing.table.TableColumnModel;
 
 import carcassonne.control.MainController;
 import carcassonne.model.Round;
+import carcassonne.view.GlobalKeyBindingManager;
 import carcassonne.view.main.MainGUI;
 
 /**
@@ -60,6 +64,16 @@ private void buildTable(Round round) {
         table.setBackground(BODY_COLOR);
     }
 
+    /**
+     * Adds the global key bindings to this UI.
+     * @param keyBindings are the global key bindings.
+     */
+    public void addKeyBindings(GlobalKeyBindingManager keyBindings) {
+        InputMap inputMap = table.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
+        ActionMap actionMap = table.getActionMap();
+        keyBindings.addKeyBindingsToMaps(inputMap, actionMap);
+    }
+
     /**
      * Hides and disposes the GUI.
      */