import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;

public class DemoFX extends Application {
    
    // constants: placeholders (names) that hold a value
    //            once initialized, it cannot change
    //            naming convention is all CAPS, underscore between words
    //            keywords: static final
    public static final int APP_WIDTH  = 400;
    public static final int APP_HEIGHT = 300;
    
    // GUI variables
    private Button bnOK;
    
    // non-GUI, functional variables
    
    public void start(Stage stage) {
        
        bnOK = new Button("OK");

        Scene scene = new Scene(bnOK, APP_WIDTH, APP_HEIGHT);
        
        stage.setScene(scene);
        stage.setTitle("CS112 Demo FX");
        stage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }

}