i need help coding this in java:

Instrcuctions:

Cell Solutions, a cell phone provider, sells the following data plans:

$8$ gigabytes per month: $$45\mathrm{.}00$ per month

$16$ gigabytes per month: $$65\mathrm{.}00$ per month

$20$ gigabytes per month: $$99\mathrm{.}00$ per month

The provider sells the following phones. $($A $6$ percent sales tax applies to the sale of a phone.$)$

Model $100$: $$299\mathrm{.}95$

Model $110$: $$399\mathrm{.}95$

Model $200$: $$499\mathrm{.}95$

Customers may also select the following options:

Phone Replacement Insurance: $$5\mathrm{.}00$ per month

WiFi Hotspot Capability: $$10\mathrm{.}00$ per month

Write an application that displays a menu system. The menu system should allow the user to select one data plan, one phone, and any of the options desired. As the user selects items from the menu, the application should show the prices of the items selected.

this is in main.java:

import javafx.application.Application;

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.layout.VBox;

import javafx.scene.layout.HBox;

import javafx.geometry.Pos;

import javafx.geometry.Insets;

import javafx.scene.control.Label;

import javafx.scene.control.Button;

import javafx.scene.control.RadioButton;

import javafx.scene.control.CheckBox;

import javafx.scene.control.ListView;

import javafx.scene.control.SelectionMode;

import javafx.scene.control.ToggleGroup;

import javafx.collections.ObservableList;

$/**$

Smartphone Packages

$*/$

public class SmartphonePackages extends Application

$\{$

public static void main$($String$[]$ args$)$

$\{$

$//$ Launch the application.

launch$($args$)$;

$\}$

@Override

public void start$($Stage primaryStage$)$

$\{$

$//$ Data plan radio buttons

RadioButton gig$8$RadioButton $=$ new RadioButton$("8$ Gigabytes per month"$)$;

RadioButton gig$16$RadioButton $=$ new RadioButton$("16$ Gigabytes per month"$)$;

RadioButton gig$20$RadioButton $=$ new RadioButton$("20$ Gigabytes per month"$)$;

gig$8$RadioButton.setSelected$($true$)$;

ToggleGroup dataGroup $=$ new ToggleGroup$()$;

gig$8$RadioButton.setToggleGroup$($dataGroup$)$;

gig$16$RadioButton.setToggleGroup$($dataGroup$)$;

gig$20$RadioButton.setToggleGroup$($dataGroup$)$;

Label dataPrompt $=$ new Label$("$Select a Data Plan"$)$;

Label dataDescriptor $=$ new Label$("$Data Plan Cost:"$)$;

Label dataCostLabel $=$ new Label$("$$$45$ per month"$)$;

HBox dataCostHBox $=$ new HBox$(10,$ dataDescriptor, dataCostLabel$)$;

VBox dataVBox $=$ new VBox$(10,$ dataPrompt, gig$8$RadioButton, gig$16$RadioButton,

gig$20$RadioButton, dataCostHBox$)$;

$//$ Register event handlers for the data plan radio buttons

gig$8$RadioButton.setOnAction$($event $->$

$\{$

dataCostLabel.setText$("$$$45$ per month"$)$;

$\})$;

gig$16$RadioButton.setOnAction$($event $->$

$\{$

dataCostLabel.setText$("$$$65$ per month"$)$;

$\})$;

gig$20$RadioButton.setOnAction$($event $->$

$\{$

dataCostLabel.setText$("$$$99$ per month"$)$;

$\})$;

$//$ Phone radio buttons

$//$ Register event handlers for the phone radio buttons

$//$ Options

CheckBox insuranceCheckBox $=$ new CheckBox$("$Phone Replacement Insurance"$)$;

CheckBox hotspotCheckBox $=$ new CheckBox$("$WiFi Hotspot Capabilty"$)$;

Label optionsDescriptor $=$ new Label$("$Options Cost:"$)$;

Label optionsCostLabel $=$ new Label$("$$$0")$;

HBox optionsCostHBox $=$ new HBox$(10,$ optionsDescriptor, optionsCostLabel$)$;

VBox optionsVBox $=$ new VBox$(10,$ insuranceCheckBox, hotspotCheckBox, optionsCostHBox$)$;

$//$ Register event handlers for the check boxes

insuranceCheckBox.setOnAction$($event $->$

$\{$

$\})$;

hotspotCheckBox.setOnAction$($event $->$

$\{$

$\})$;

$//$ Put everything into a VBox

VBox mainVBox $=$ new VBox$(10,$ dataVBox, phoneVBox, optionsVBox$)$;

mainVBox.setAlignment$($Pos$.$CENTER$)$;

mainVBox.setPadding$($new Insets$(10))$;

$//$ Add the main VBox to a scene.

Scene scene $=$ new Scene$($mainVBox$)$;

$//$ Set the scene to the stage aand display it$.$

primaryStage.setScene$($scene$)$;

primaryStage.show$()$;

$\}$

$\}$