package javaapplication13;

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

public class JavaApplication13 extends Application {

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

    @Override
    public void start(Stage stage) throws Exception {
        TextField lv = new TextField();

        final Button b = new Button("Button");
        b.setDefaultButton(true);
        b.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent t) {
                System.out.println("Fire!");
                b.setDefaultButton(false);
            }
        });

        stage.setScene(new Scene(new VBox(lv, b)));
        stage.show();
    }
}