Java: How to Start a Standalone Application from the Current One When Both Are in the Same Package

Make JavaFX Application non static

Per JVM instance you can only have one JavaFX application and one JavaFX application thread running.

But you can create multiple Stages (windows), if that is what you're looking for. The primary stage is provided by the start method but you can create secondary stages yourself.

Can you write two different Java FX scenes as two separate classes?

Pete as I understand you wish to separate one big java file into small files,create Java classes in each class create method(function) that will return layout(HBox,VBox, Flowpane or ....)then in your main create an object of that Java class and use those methods to build on big application.

in my sample I made one main and one separated class with one function,just to show you how its works. In my main there is 2 lables, 2 buttons one layout and one object of the separated class, by clicking the buttons scenes will change
My Main:

public class SwitchSceneSample extends Application {
public static void main(String[] args) {
    launch(args);
}

Stage window;
Scene scene1, scene2;

@Override
public void start(Stage primaryStage) throws Exception {
    // I am using window as primaryStage
    window = primaryStage;
    // Label 1
    Label label1 = new Label("Welcome to the first scene!");
    // Label 2
    Label label2 = new Label("This is second scene!");
    // Button 1, by pressing this button primaryStage will be set as scene 2
    Button button1 = new Button("Go to scene 2");
    button1.setOnAction(e -> window.setScene(scene2));
    // Button 2, by pressing this button primaryStage will be set as scene 1
    Button button2 = new Button("Click to go scene 1");
    button2.setOnAction(e -> window.setScene(scene1));
    // Creating an object of the class'LayoutOne.java'
    LayoutOne l1 = new LayoutOne();
    // set my scene 1(by calling method called 'sceneView1()' from class 'LayoutOne.java')
    scene1 = new Scene(l1.sceneView1(label1, button1), 200, 200);
    // Set my scene 2 inside my main class
    StackPane layout2 = new StackPane();
    layout2.getChildren().addAll(label2, button2);
    scene2 = new Scene(layout2, 600, 300);
    // Making my 
    window.setScene(scene1);
    window.setTitle("Scene Switch Sample");
    window.show();
}

}

My Second Class:

public class LayoutOne {
public VBox sceneView1(Label label, Button button) {

    // Layout 1 - children are laid out in vertical column
    VBox layout1 = new VBox(20);
    layout1.getChildren().addAll(label, button);

    return layout1;
}

}

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