Question

in java What object is passed to the start method in a JavaFX program? What should you do with it?

Answer 1

A JavaFX application have three important components namely Stage, Scene and Nodes.

A stage (a window) includes all the objects of a JavaFX application. It is represented by Stage class of the package javafx.stage. The primary stage is built by the platform itself. The created stage object is passed as an argument to the start() method of the Application class. A scene represents the physical contents of a JavaFX application. It shows all the contents of a scene graph. The class Scene of the package javafx.scene represents the scene object.

Stage is the container of any JavaFX application and it provides a window for the application. It is represented by the Stage class of the package javafx.stage. An object of this class is passed as a parameter of the start() method of the Application class.

Using this object, you can operate various operations on the stage. Most importantly, you can perform the following:

• Set the title for the stage using the method setTitle().
• Attaching the scene object to the stage using the setScene() method.
• Display the contents of the scene using the show() method .

//Set the title to Stage.
primaryStage.setTitle("Sample");

//Set the scene to Stage
primaryStage.setScene(scene);

//Display the stage
primaryStage.show();