title: JavaFX change stage size from outside the constructor
body: <p>I have something like </p>
  
  <pre><code>public class MyClass extends Application {
  
      public void start(Stage stage) {
          MyModel model = new MyModel();
          MyController controller = new MyController(model);
          MyView view = new MyView(model, controller);
          Scene scene = new Scene(view);
  
          stage.setTitle("MyTitle");
          stage.setScene(scene);
          stage.sizeToScene();
          stage.show();
          view.requestFocus();
      }
  
      public void changeStageSize(int width, int height) {
          ...
      }
  
      public static void main(String[] args) {
          launch(args);
      }
  }
  </code></pre>
  
  <p>What do I have to write into my changeStageSize void to change my <em>stage</em> size?</p>