If line 32 in Listing 1 BounceBallControl.java is not in the program, what would happen wh...

If line 32 in Listing 1 BounceBallControl.java is not in the program, what would happen when you press the UP or the DOWN arrow key?

Listing 1 BounceBallControl.java

1 import javafx.application.Application;
2 import javafx.stage.Stage;
3 import javafx.scene.Scene;
4 import javafx.scene.input.KeyCode;
5
6 public class BounceBallControl extends Application {
7 @Override // Override the start method in the Application class
8 public void start(Stage primaryStage) {
9 BallPane ballPane = new BallPane(); // Create a ball pane
10
11 // Pause and resume animation
12 ballPane.setOnMousePressed(e -> ballPane.pause());
13 ballPane.setOnMouseReleased(e -> ballPane.play());
14
15 // Increase and decrease animation
16 ballPane.setOnKeyPressed(e -> {
17 if (e.getCode() == KeyCode.UP) {
18 ballPane.increaseSpeed();
19 }
20 else if (e.getCode() == KeyCode.DOWN) {
21 ballPane.decreaseSpeed();
22 }
23 });
24
25 // Create a scene and place it in the stage
26 Scene scene = new Scene(ballPane, 250, 150);
27 primaryStage.setTitle("BounceBallControl"); // Set the stage title
28 primaryStage.setScene(scene); // Place the scene in the stage
29 primaryStage.show(); // Display the stage
30
31 // Must request focus after the primary stage is displayed
32 ballPane.requestFocus();
33 }
34 }