12.3. Setting Up JavaFX

To start using JavaFX:

🔧 Installation: • Use JDK 11+ with OpenJFX SDK • Set environment variables • Use IDE support (e.g., IntelliJ, Eclipse with e(fx)clipse plugin)

To use JavaFX, you first need to install the Java Development Kit, specifically JDK version 11 or higher, along with the OpenJFX SDK. The OpenJFX SDK provides the necessary libraries and tools to develop JavaFX applications. After installation, it's essential to set up your environment variables so that your system recognizes JavaFX. Further, you can enhance your development experience by using an Integrated Development Environment (IDE) like IntelliJ or Eclipse, both of which support JavaFX development, particularly with an added plugin called e(fx)clipse in Eclipse.

Think of setting up JavaFX like setting up a new kitchen. You need to have the right tools (JDK and OpenJFX SDK) ready, ensure everything is connected correctly (environment variables), and use a well-equipped kitchen (IDE) to cook up your applications effectively.

✅ Hello World Example

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

public class HelloFX extends Application {
    @Override
    public void start(Stage primaryStage) {
        Label label = new Label("Hello, JavaFX!");
        Scene scene = new Scene(label, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.setTitle("JavaFX Demo");
        primaryStage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}

The 'Hello World' example demonstrates how to create a simple JavaFX application. It starts by importing essential JavaFX classes. The HelloFX class extends the Application class, which is the entry point for JavaFX applications. In the start method, a Label is created that displays the text 'Hello, JavaFX!'. Then, a Scene is created with this label, defining its dimensions (300 pixels wide, 200 pixels tall). The primary stage, which represents the main window, is set with this scene and given a title. Finally, the show method makes the stage visible. The main method calls launch, which starts the application.

Imagine you are writing a letter. The start method is like the introduction of your letter, where you greet the reader. The Label is akin to the text that directly conveys your message — in this case, 'Hello, JavaFX!'. Just like you’d neatly write your letter and show it to your friend, you create a scene with the label and present it by showing the primary stage.

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