Hello World JavaFX application

Last update on December 21 2024 09:39:45 (UTC/GMT +8 hours)

Write a JavaFX application that displays a "Hello, JavaFX!" message in a window. Your system's Java and JavaFX versions are displayed as well.

Sample Solution:

JavaFx Code:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        // Create a label to display the "Hello, JavaFX!" message.
        Label helloLabel = new Label(" Hello, JavaFX!");

        // Create labels to display the Java and JavaFX versions.
        Label javaVersionLabel = new Label(" Java Version: " + System.getProperty("java.version"));
        Label javafxVersionLabel = new Label(" JavaFX Version: " + System.getProperty("javafx.version"));

        // Create a VBox layout to arrange the labels vertically.
        VBox root = new VBox(10); // 10 is the spacing between elements.
        root.getChildren().addAll(helloLabel, javaVersionLabel, javafxVersionLabel);

        // Create the scene and set it in the stage.
        Scene scene = new Scene(root, 300, 150); // Width and height of the window.
        primaryStage.setScene(scene);

        // Set the title of the window.
        primaryStage.setTitle("Hello JavaFX App");

        // Show the window.
        primaryStage.show();
    }
}

Explanation:

In the exercise above -

Import the necessary JavaFX libraries.
Create a class "Main" that extends "Application" and overrides the "start()" method.
Inside the "start()" method:

Create labels for "Hello, JavaFX!", Java version, and JavaFX version.
Organize these labels in a vertical layout (VBox) with 10 pixels of spacing between them.

Create a Scene with the layout, setting the window dimensions to 300x150.
Set the window's title to "Hello JavaFX App."
Display the window.

Sample Output:

Flowchart:

Java Code Editor:

Previous: JavaFx Basic Exercises Home.
Next: Button click event in JavaFX.