package sample; import javafx.application.Application; import javafx.event.EventHandler; import javafx.fxml.FXMLLoader; import javafx.scene.Group; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.input.MouseButton; import javafx.stage.Stage; import javafx.scene.input.MouseEvent; public class Main extends Application { @Override public void start(Stage primaryStage) throws Exception{ //Parent root = FXMLLoader.load(getClass().getResource("sample.fxml")); Group root = new Group(); primaryStage.setTitle("Hello World"); primaryStage.setScene(new Scene(root, 300, 275)); Button button = new Button("Exit"); button.setDefaultButton(true); button.setLayoutX(130);button.setLayoutY(125); EventHandler eventHandler = new EventHandler() { @Override public void handle(MouseEvent event) { System.exit(0); } }; button.addEventFilter(MouseEvent.MOUSE_CLICKED,eventHandler); root.getChildren().add(button); primaryStage.show(); } public static void main(String[] args) { launch(args); } }