Code for adding three buttons in left region and adding text area in center region:

The code for given condition is given below:

//Create object for "BorderPane"

BorderPane root = new BorderPane();

//Create VBox object for left region

VBox left_pane = new VBox();

//Create VBox object for center region

VBox center_pane = new VBox();

//Create three buttons for left pane

left_pane.getChildren().add(new Button("Button1"));

left_pane.getChildren().add(new Button("Button2"));

left_pane.getChildren().add(new Button("Button3"));

//Create a text area for center pane

center_pane.getChildren().add(new TextArea());

//Add left region to border pane

root.setLeft(left_pane);

//Add center region to center pane

root.setCenter(center_pane);

Complete code:

The complete code for adding three buttons in left region and adding text area in center region to border pane is given below:

//Import required package

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.stage.Stage;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.VBox;

import javafx.scene.control.TextArea;

import javafx.scene.control.Button;

//Define "BorderPaneTest" class

public class BorderPaneTest extends Application

{

//Define main function

public static void main(String[] args)

{

//Launch the application

launch(args);

}

//Define "start" function

@Override

public void start(Stage primStage) throws Exception

{

//Create object for "BorderPane"

BorderPane root = new BorderPane();

//Create VBox object for left region

VBox left_pane = new VBox();

//Create VBox object for center region

VBox center_pane = new VBox();

//Create three buttons for left pane

left_pane...