Hello! I need some help with my Java homework. Please use Eclipse with JavaFX Please add comments on the program so I can understand what the code is doing and learn Don't use Liang's BallPane class. Just draw a Circle. 15.3 (Move the ball) Write a program that moves the ball in a pane. You should define a pane class for displaying the ball and provide the methods for moving the ball left, right, up, and down, as shown in Figure 15.26c. Check the boundary to prevent the ball from moving out of sight completely.

//MoveTheBall.java

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class MoveTheBall extends Application {

    //for holdong the ball create a Pane class
    private class Ball extends Pane {
        
        //distance which the ball moves at once
        private final int MOVE_DISTANCE = 10;
        //radius of the ball
        private final int RADIUS = 15;
        //Circle object representing the ball
        private Circle circle;

        //constructor method for initializing the Ball at specific x,y coordinates
        public Ball(double x, double y) {
            //initializing Circle, setting white fill and black stroke
            circle = new Circle(x, y, RADIUS);
            circle.setFill(Color.WHITE);
            circle.setStroke(Color.BLACK);
            //adding to this pane
            getChildren().add(circle);
        }

        //move the ball to the left
        public void moveLeft() {
            //move only if the ball does not exceed the boundary
            if ((circle.getCenterX() - MOVE_DISTANCE) >= RADIUS) {
                circle.setCenterX(circle.getCenterX() - MOVE_DISTANCE);
            }
        }
        
        //move the ball to the right
        public void moveRight() {
            //move only if the ball does not exceed the boundary
            if ((circle.getCenterX() + MOVE_DISTANCE) <= (getWidth() - RADIUS)) {
                circle.setCenterX(circle.getCenterX() + MOVE_DISTANCE);
            }
        }

        //move the ball up
        public void moveUp() {
            //move only if the ball does not exceed the boundary
            if ((circle.getCenterY() - MOVE_DISTANCE) >= RADIUS) {
                circle.setCenterY(circle.getCenterY() - MOVE_DISTANCE);
            }
        }
        
        //move the ball down
        public void moveDown() {
            //move only if the ball does not exceed the boundary
            if ((circle.getCenterY() + MOVE_DISTANCE) <= (getHeight()- RADIUS)) {
                circle.setCenterY(circle.getCenterY() + MOVE_DISTANCE);
            }
        }
    }

    @Override
    public void start(Stage primaryStage) {
        Ball ball =new Ball(100,100);   //create a Ball at (100,100)

        Button left = new Button("Left");   //create four buttons
        Button right = new Button("Right");
        Button up = new Button("Up");
        Button down = new Button("Down");

        //create an HBox to hold left and right buttons with 10px spacing
        HBox hbox = new HBox(10, left, right, up, down);
        hbox.setAlignment(Pos.CENTER);    //center aligning the components
        hbox.setPadding(new Insets(10));     //adding some padding space around the hbox

        //adding action listeners to call appropriate functions in Ball class
        left.setOnAction(e -> ball.moveLeft());
        right.setOnAction(e -> ball.moveRight());
        up.setOnAction(e -> ball.moveUp());
        down.setOnAction(e -> ball.moveDown());

        BorderPane root = new BorderPane();   //creating a BorderPane

        root.setCenter(ball);    //adding ball to center and hbox to bottom
        root.setBottom(hbox);

        Scene scene = new Scene(root);   //set up the scene

        primaryStage.setScene(scene);     //setting and displaying the scene
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}