Added an option do delete message in notificationText in GameController again

src/main/java/ch/unibas/dmi/dbis/cs108/gamelogic/Game.java

@@ -86,9 +86,7 @@ public class Game implements Runnable {
    * Initializes new thread that constantly sends a gameState update to all clients in this game
    */
   public void gameStateModelUpdater(){
-    new Thread(new Runnable() {
-      @Override
-      public void run() {
+    new Thread(() -> {
       while (getGame().isOngoing) {
         for (Passenger passenger : getGameState().getPassengerTrain()) {
           passenger.send(GuiParameters.updateGameState, getGame());
@@ -99,7 +97,6 @@ public class Game implements Runnable {
           e.printStackTrace();
         }
       }
-      }
     }).start();
 
   }

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/client/Client.java

@@ -342,8 +342,8 @@ public class Client {
         case GuiParameters.listOfPLayers:
           break;
         default:
-          gameController.addMessageToNotificationText(
-              data); //TODO(Sebi,Seraina): should the gameController be in the Application just like the ChatController?
+          notificationTextDisplay(data);
+        //TODO(Sebi,Seraina): should the gameController be in the Application just like the ChatController?
       }
     } catch (Exception e) {
       LOGGER.warn("Communication with GUI currently not possible: " + e.getMessage());
@@ -352,6 +352,24 @@ public class Client {
 
   }
 
+  /**
+   * Starts a new thread, thad adds a message to notificationText in the gameController,
+   * waits 3 seconds and deletes it again.
+   * @param data the message to be added
+   */
+  public void notificationTextDisplay(String data) {
+    new Thread(() -> {
+      gameController.addMessageToNotificationText(data);
+      try {
+        Thread.sleep(3000);
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+      gameController.clearNotificationText();
+    }).start();
+
+  }
+
   public void determineNoiseDisplay(int position) {
     switch (position) {
       case 0:

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/client/gui/game/GameController.java

@@ -167,6 +167,13 @@ public class GameController {
   //TODO: Wait for a certain time, then clear all again
  }
 
+ /**
+  * Clears all children from notificationText TextFlow
+  */
+ public void clearNotificationText() {
+  notificationText.getChildren().clear();
+ }
+
  /**
   * Updates the labels of the rooms accordingly to the datastructures in GameStateModel
   */