GUI2

Question 1

What is an event in JavaFX?

Answer 1

An event occurs when a user interacts with the application, such as clicking a button or moving the mouse.

Question 2

What is the default style sheet for JavaFX applications?

Answer 2

The default style sheet is modena.css, located in the jfxrt.jar file.

Question 3

How can you extract the modena.css file from the JAR file?

Answer 3

Use the command: jar xf jfxrt.jar com/sun/javafx/scene/control/skin/modena/modena.css

Question 4

What does a style sheet in JavaFX control?

Answer 4

It controls the look of user interface elements.

Question 5

True or False: JavaFX CSS is based on the W3C CSS version 2.1 specification.

Answer 5

True

Question 6

List some layout panes provided by the JavaFX SDK.

Answer 6

• BorderPane
• HBox
• VBox
• StackPane
• GridPane
• FlowPane
• TilePane
• AnchorPane

Question 7

What is an EventHandler in JavaFX?

Answer 7

An EventHandler contains application logic to process an event.

Question 8

What are the two broad classifications of events in JavaFX?

Answer 8

• Foreground Events
• Background Events

Question 9

What is the base class for an event in JavaFX?

Answer 9

The class named Event in the javafx.event package.

Question 10

What type of event is represented by the class MouseEvent?

Answer 10

Mouse input events such as mouse clicked, mouse pressed, mouse released.

Question 11

What does the KeyEvent class represent?

Answer 11

It indicates the key stroke occurred on a node.

Question 12

Fill in the blank: The event handling mechanism in JavaFX controls the event and decides what should happen when an event occurs, and the code that is executed is known as an _______.

Answer 12

[event handler]

Question 13

What are the phases of event handling in JavaFX?

Answer 13

• Route Construction
• Event Capturing Phase
• Event Bubbling Phase

Question 14

Describe the Event Capturing Phase.

Answer 14

The event travels from the root node down to the target node, executing any registered filters.

Question 15

Describe the Event Bubbling Phase.

Answer 15

The event travels from the target node back up to the root node, executing any registered handlers.

Question 16

What is the purpose of the Scene in a JavaFX application?

Answer 16

It holds all the physical contents (nodes) of the application.

Question 17

What is the structure of a JavaFX application?

Answer 17

It consists of three main components: Stage, Scene, and nodes.

Question 18

What class must be imported to create a JavaFX application?

Answer 18

javafx.application.Application

Question 19

What method must be overridden to start a JavaFX application?

Answer 19

The start() method.

Question 20

What is the role of the Stage in a JavaFX application?

Answer 20

It acts as a container for all JavaFX objects.

Question 21

True or False: The primary stage in a JavaFX application is created by the application itself.

Answer 21

False

Question 22

What is FXML in JavaFX?

Answer 22

FXML is an XML vocabulary for defining and arranging JavaFX GUI controls without writing Java code.

Question 23

What does JavaFX Scene Builder allow you to do?

Answer 23

Create GUIs by dragging and dropping GUI components.

Question 24

Fill in the blank: JavaFX enables you to change the look-and-feel of your GUI using _______.

Answer 24

[Cascading Style Sheets (CSS)]

Question 25

What is the primary purpose of creating style sheets in JavaFX?

Answer 25

To override the styles in the default style sheet and to add custom styles.

Question 26

What is the first step in creating a JavaFX application?

Answer 26

Extend the Application class and override the start() method.

Question 27

What happens when the show() method is called on the primary stage object?

Answer 27

It displays the primary stage.

Question 28

What is the significance of the root node in the scene graph?

Answer 28

It acts as a parent node for all other nodes present in the scene graph.

Question 29

What are leaf nodes in the context of a scene graph?

Answer 29

Nodes that exist at the lowest level in the tree hierarchy.

Question 30

True or False: You need to know FXML or XML to study JavaFX.

Answer 30

False