Display a message on the screen

Question

I would like to display a message onto the screen upon the button press. The message should not have any window and should be displayed at the center of the screen over any

Answer 1

This is a tough question to answer because it doesn't really show what you've tried to do, but I will attempt to put my comment suggestion to light and show you a simple example that might be closer to what you want.

Create a simple FXML file (for JavaFX) that defines a pane with a label on it. Give the label an ID and assign a controller to it.

Sample file (TestDialog.fxml), defining a simple pane with a label:

In your controller class, define a function that will allow you to close the pane. You may or may not want more, depending on your needs.

import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.stage.Stage;

import java.net.URL;
import java.util.ResourceBundle;
public class MyController implements Initializable {
    @FXML
    private Label textLabel;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {

    }

    public void close() {
        ((Stage)textLabel.getScene().getWindow()).close();
    }
}

Then, in your main code, display the window. This example opens it as a top-level, but you can use it as a child stage too.

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class Main extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        FXMLLoader myLoader = new FXMLLoader(getClass().getResource("TestDialog.fxml"));
        Parent root = (Parent)myLoader.load();
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.initStyle(StageStyle.UNDECORATED);  // this style sets the stage to have no border or buttons/title bar
        stage.setResizable(false);
        stage.show();
    }

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

The result looks like this

*Note that this code, as written, does not provide a way to close the dialog. That's an exercise left up to you. This was simply an example used to show you the effect.