JavaFX

Which JavaFX method initializes the application and sets up the stage?

• start()
• init()
• setup()
• launch()

Answer explanation

The start() method is overridden to initialize the stage and set up the GUI.

How do you add a Button to a VBox in JavaFX?

• vbox.add(button)
• vbox.getChildren().add(button)
• vbox.addChild(button)
• vbox.addNode(button)

Answer explanation

The getChildren().add() method is used to add nodes to a layout container like VBox.

In JavaFX, which method is used to launch the application?

• main()
• launch()
• run()
• execute()

Answer explanation

The launch() method starts the JavaFX application lifecycle.

What is the default size of a JavaFX Stage if no size is set?

• 200x200
• 800x600
• 400x300
• 600x400

Answer explanation

By default, JavaFX sets the Stage size to 400x300 pixels.

How do you apply a CSS file to a JavaFX Scene?

• scene.applyCss("style.css")
• scene.addStylesheet("style.css")
• scene.getStylesheets().add("style.css")
• scene.setCss("style.css")

Answer explanation

The getStylesheets().add() method is used to link a CSS file to a Scene.

What does the Scene class represent in JavaFX?

• The layout of the application
• The visual content of the stage
• The application entry point
• A container for nodes

Answer explanation

A Scene contains all the visual elements displayed on the stage.

True or False: JavaFX controls can be styled using CSS.

• True
• False
• N/A
• N/A

Answer explanation

JavaFX supports CSS for styling its controls.

How do you attach an event to a Button in JavaFX?

• button.addAction()
• button.setOnAction()
• button.onClick()
• button.addListener()

Answer explanation

The setOnAction() method is used to attach event handlers to a Button.

In JavaFX, which layout places nodes in a grid of rows and columns?

• BorderPane
• GridPane
• VBox
• TilePane

Answer explanation

GridPane organizes nodes in a grid layout with rows and columns.

Which JavaFX class is used to display an image?

• ImageView
• ImageDisplay
• ImageNode
• PictureBox

Answer explanation

The ImageView class is used to display images in JavaFX.