JAVA 1 of 2: Modul 04

Which statements are right about a JavaFX class? - several alternatives possible

Any JavaFX class

1 . inherit Application

2. must use a layout class

3. override the start () method

4. must have a main () method

Which of these are layout containers? - several alternatives possible

1 . Shape

2. FlowPane

3. HBox

4. Control

5. BorderPane

Which statements are correct? - several alternatives possible

1. An stage is available at the start of a JavaFX application

2. You can have several stages in a JavaFX application

3. A stage is displayed using the show () method

4. A scene is inserted into a stage using the addScene () method

Study the following code:

 public void start(Stage primaryStage) { HBox pane = new HBox(5); Circle circle = new Circle(50, 200, 200); pane.getChildren().addAll(circle); circle.setCenterX(100); circle.setCenterY(100); circle.setRadius(50); pane.getChildren().addAll(circle); // Create a scene and place it in the stage Scene scene = new Scene(pane); primaryStage.setTitle("Test"); // Set the stage title primaryStage.setScene(scene); // Place the scene in the stage primaryStage.show(); // Display the stage }

1. The program has a compilation error because the Circle object is added twice

2. The program has a runtime error because the Circle object is added twice

3. Programs run fine and show a circle

4. The program runs fine and shows two circles

A JavaFX action event handler is an instance of

1. ActionEvent

2. Action

3. EventHandler

4. EventHandler

A JavaFX action event handler has a method

1. public void actionPerformed(ActionEvent e)

2. public void actionPerformed(Event e)

3. public void handle(ActionEvent e)

4. public void handle(Event e)

To connect the source to an event listener for an action event, use

1. source.addAction(handler)

2. source.setOnAction(handler)

3. source.addOnAction(handler)

4. source.setActionHandler(handler)

 Which of the following code lines is a correct implementation of linking a trader with a button btOK? - several alternatives possible

1. btOK.setOnAction(e -> System.out.println("Handle the event"));

2. btOK.setOnAction((e) -> System.out.println("Handle the event"));

3. btOK.setOnAction((ActionEvent e) -> System.out.println("Handle the event"));

4. btOK.setOnAction(e -> {System.out.println("Handle the event");});