Update code quality and exit functionality

src/main/java/duke/functionality/Storage.java

@@ -102,7 +102,7 @@ public TaskList readFileDataAndStoreInList(File file) throws FileNotFoundExcepti
      * @param task the Task object to be checked.
      */
     public Task checkTaskDone(int mark, Task task) {
-        if(mark == 1){
+        if (mark == 1) {
             task.setTaskDone();
         }
         return task;

src/main/java/duke/main/Duke.java

@@ -15,12 +15,13 @@
 public class Duke {
     protected Storage storage;
     protected TaskList taskList;
-
+    protected boolean isExit;
     /**
      * Default constructor for Duke class.
      */
     public Duke() {
         this.taskList = new TaskList(); //default task list
+        this.isExit = false;
     }
 
     /**
@@ -35,6 +36,10 @@ public void initializeStorage(String pwd, String filePath) throws IOException {
         this.taskList = storage.load();
     }
 
+    public boolean getExitStatus() {
+        return this.isExit;
+    }
+
     /**
      * Returns a message that corresponds to the action taken by the input of the user.
      * @param input user's input.
@@ -46,6 +51,10 @@ public String getResponse(String input) {
             Command command = Parser.parse(input);
             output = command.execute(taskList);
             Storage.updateTextFile(taskList);
+
+            if (command.isExit()) {
+                this.isExit = true;
+            }
             return output;
         } catch (DukeException e) {
             return e.getMessage();

src/main/java/duke/main/MainWindow.java

@@ -2,13 +2,16 @@
 
 import java.io.IOException;
 
+import javafx.animation.PauseTransition;
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
 import javafx.scene.control.ScrollPane;
 import javafx.scene.control.TextField;
 import javafx.scene.image.Image;
 import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.VBox;
+import javafx.util.Duration;
 
 /**
  * Controller for MainWindow. Provides the layout for the other controls.
@@ -25,6 +28,7 @@ public class MainWindow extends AnchorPane {
 
     private Duke duke;
 
+
     private Image userImage = new Image(this.getClass().getResourceAsStream("/images/DaUser.png"));
     private Image dukeImage = new Image(this.getClass().getResourceAsStream("/images/DaJamie.png"));
 
@@ -53,6 +57,7 @@ public void setDuke(Duke duke) {
         }
     }
 
+
     /**
      * Creates two dialog boxes, one echoing user input and the other containing Duke's reply and then appends them to
      * the dialog container. Clears the user input after processing.
@@ -66,5 +71,10 @@ private void handleUserInput() {
                 DialogBox.getDukeDialog(response, dukeImage)
         );
         userInput.clear();
+        if (duke.getExitStatus()) {
+            PauseTransition delay = new PauseTransition(Duration.seconds(1.2));
+            delay.setOnFinished(event -> Platform.exit());
+            delay.play();
+        }
     }
 }