Uso de BorderPane

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
/**
 * @see https://www.jc-mouse.net
 * @author mouse
 */
public class TestBorderPane extends Application{
      
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage){
        //layout
        BorderPane borderPane = new BorderPane();        
        //control parte superior
        Button topButton = new Button("TOP");        
        borderPane.setTop( topButton );    
        //control parte inferior
        Button bottomButton = new Button("BOTTOM");        
        borderPane.setBottom(bottomButton);
        //control en lado izquierdo
        Button leftButton = new Button("LEFT");        
        borderPane.setLeft(leftButton);
        //control en lado derecho
        Button rightButton = new Button("RIGHT");        
        borderPane.setRight(rightButton);
        //Control en el centro
        borderPane.setCenter(new Button("CENTER"));
        
        //alineacion de controles respecto el lugar del Pane que se encuentren
        BorderPane.setAlignment(topButton, Pos.CENTER);
        BorderPane.setAlignment(bottomButton, Pos.CENTER);
        BorderPane.setAlignment(leftButton, Pos.CENTER);
        BorderPane.setAlignment(rightButton, Pos.CENTER);       
        
        Scene scene = new Scene(borderPane);        
        primaryStage.setScene(scene);
        primaryStage.show();
    }    
}