How to include JavaFX scene functions into public static void main

Question

I would like to know if is there a possibility to include JavaFX scene functions into

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

Inside public static void main there is launch(args); a helloworld.java JavaFX program looks like this:

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import static javafx.geometry.HPos.RIGHT;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Login extends Application {

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("JavaFX Welcome");
        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(25, 25, 25, 25));


        Text scenetitle = new Text("Welcome");
        scenetitle.setId("welcome-text");
     //   scenetitle.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20));
        grid.add(scenetitle, 0, 0, 2, 1);

        Label userName = new Label("User Name:");
        grid.add(userName, 0, 1);

        TextField userTextField = new TextField();
        grid.add(userTextField, 1, 1);

        Label pw = new Label("Password:");
        grid.add(pw, 0, 2);

        PasswordField pwBox = new PasswordField();
        grid.add(pwBox, 1, 2);

        Button btn = new Button("Sign in");
        HBox hbBtn = new HBox(10);
        hbBtn.setAlignment(Pos.BOTTOM_RIGHT);
        hbBtn.getChildren().add(btn);
        grid.add(hbBtn, 1, 4);

        final Text actiontarget = new Text();
        grid.add(actiontarget, 0, 6);
        grid.setColumnSpan(actiontarget, 2);
        grid.setHalignment(actiontarget, RIGHT);
        actiontarget.setId("actiontarget");

        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent e) {
               // actiontarget.setFill(Color.FIREBRICK);
                actiontarget.setId("actiontarget");
                actiontarget.setText("Sign in button pressed");
            }
        });

        Scene scene = new Scene(grid, 300, 275);
        primaryStage.setScene(scene);

        scene.getStylesheets().add(
            Login.class.getResource("Login.css").toExternalForm());
        primaryStage.show();
    }

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

I would like to use all the whole program inside static void main, just like java Swing, just like the following program:

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;


public class combotable {
static JFrame frame = new JFrame();
static JButton boton_nuevo=new JButton("nuevo");

public static void main(String[] args){


frame.setSize(400,400);


String[] petStrings={"Bird", "Cat", "Dog", "Rabbit", "Pig"};
//JComboBox comboBox = new JComboBox(petStrings);

JComboBox<String> combo = new JComboBox<>(petStrings);
combo.setSelectedIndex(4);
//comboBox.setSelectedIndex(4);

frame.add(combo, BorderLayout.PAGE_START);

frame.add (boton_nuevo);

boton_nuevo.addActionListener( new ActionListener()
{

 public void actionPerformed(ActionEvent e) 
        {
         String s = (String) combo.getSelectedItem();
          if (s == "Bird")
                         {
                       System.out.println("Se selecciono Bird");
                          }

           if (s== "Cat")
                         {
                       System.out.println("Se selecciono Cat");
                          }
            if (s== "Dog")
                         {
                       System.out.println("Se selecciono Dog");
                          }

            if (s== "Rabbit")
                         {
                       System.out.println("Se selecciono Rabbit");
                          }
               if (s== "Pig")
                         {
                       System.out.println("Se selecciono Pig");
                          }
         }

}
);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);


}

}

Is there any chance to do this? Any help is appreciated.

Answer 1

No. Your Swing example is incorrectly synchronized in that Swing GUI objects should be constructed and manipulated only on the event dispatch thread. Your JavaFX Application is correctly synchronized in that "modification of scene graph operations to live objects (those objects already attached to a scene) must be done on the JavaFX application thread." You can override init() to do other initialization or to construct JavaFX objects other than a Scene or a Stage.