JavaFXHello.java

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package javafxhello;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class JavaFXHello extends Application {
    private Button btnHello;  // Declare a "Button" control

    @Override
    public void start(Stage primaryStage) {
        // Construct the "Button" and attach an "EventHandler"
        btnHello = new Button();
        btnHello.setText("Say Hello");
        // Using JDK 8 Lambda Expression to construct an EventHandler<ActionEvent>
        btnHello.setOnAction(evt -> System.out.println("Hello World!"));

        // Construct a scene graph of nodes
        StackPane root = new StackPane();  // The root of scene graph is a layout node
        root.getChildren().add(btnHello);  // The root node adds Button as a child

        Scene scene = new Scene(root, 300, 100);  // Construct a scene given the root of scene graph
        primaryStage.setScene(scene);    // The stage sets scene
        primaryStage.setTitle("Hello");  // Set window's title
        primaryStage.show();             // Set visible (show it)
    }

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