help me fix this javafx program:

main class:

import javafx.application.Application;

import javafx.fxml$.$FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;

import java.io$.$IOException;

public class CloudCostMonitor extends Application $\{$

@Override

public void start$($Stage stage$)$ throws Exception $\{$

Parent root $=$

FXMLLoader.load$($getClass$().$getResource$("$CloudCostMonitor$.$fxml$"))$;

Scene scene $=$ new Scene$($root$)$; $//$ attach scene graph to scene

stage.setTitle$("$Cloud Cost Monitor"$)$; $//$ displayed in window's title bar

stage.setScene$($scene$)$; $//$ attach scene to stage

stage.show$()$; $//$ display the stage

$\}$

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

$//$ create a TipCalculator object and call its start method

launch$($args$)$;

$\}$

$\}$

controller class

import javafx.event.ActionEvent;

import javafx.fxml$.$FXML;

import javafx.scene.control.Alert;

import javafx.scene.control.Button;

import javafx.scene.control.DatePicker;

import javafx.scene.control.RadioButton;

import javafx.scene.control.TextField;

import javafx.scene.control.ToggleGroup;

import java.time.Duration;

import java.time.LocalDate;

public class CloudCostController $\{$

@FXML

private TextField costTextField;

@FXML

private TextField monthlyCostTextField;

@FXML

private TextField usageTextField;

@FXML

private TextField alertTextField;

@FXML

private RadioButton dropboxRadioButton;

@FXML

private DatePicker durationDatePicker;

@FXML

private Button enterButton;

@FXML

private RadioButton googleRadioButton;

@FXML

private RadioButton onedriveRadioButton;

@FXML

private ToggleGroup providerGroup;

@FXML

private TextField storageTextField;

private final double DROPBOX$\_$RATE$\_$PER$\_$GB $=0\mathrm{.}02$;

private final double GOOGLE$\_$RATE$\_$PER$\_$GB $=0\mathrm{.}01$;

private final double ONEDRIVE$\_$RATE$\_$PER$\_$GB $=0\mathrm{.}015$;

private final double STORAGE$\_$LIMIT$\_$GB $=100$; $//$ Example limit$,$ you can change it

@FXML

void initialize$()\{$

$//$ Set today's date as the default for the durationDatePicker

durationDatePicker.setValue$($LocalDate$.$now$())$;

$//$ Set a default cloud provider as selected. For instance, select Google Drive by default.

googleRadioButton.setSelected$($true$)$;

$//$ Clear all text fields to be cleared or set to a default value at startup:

costTextField$.$clear$()$;

monthlyCostTextField.clear$()$;

usageTextField.clear$()$;

alertTextField.clear$()$;

storageTextField.clear$()$;

$\}$

@FXML

void calculateButtonPressed$($ActionEvent event$)\{$

LocalDate startDate $=$ durationDatePicker.getValue$()$;

LocalDate endDate $=$ LocalDate.now$()$; $//$ Assume end date is today

long days $=$ Duration.between$($startDate$.$atStartOfDay$(),$ endDate.atStartOfDay$()).$toDays$()$;

double storageUsed $=$ Double.parseDouble$($storageTextField$.$getText$())$;

double costPerDay $=0$;

$//$ Determine the selected provider and calculate the cost

if $($dropboxRadioButton$.$isSelected$())\{$

costPerDay $=$ DROPBOX$\_$RATE$\_$PER$\_$GB $*$ storageUsed;

$\}$ else if $($googleRadioButton$.$isSelected$())\{$

costPerDay $=$ GOOGLE$\_$RATE$\_$PER$\_$GB $*$ storageUsed;

$\}$ else if $($onedriveRadioButton$.$isSelected$())\{$

costPerDay $=$ ONEDRIVE$\_$RATE$\_$PER$\_$GB $*$ storageUsed;

$\}$

double totalCost $=$ costPerDay $*$ days;

double monthlyCost $=$ totalCost $*30$; $//$ Assuming $30$ days in a month

costTextField$.$setText$($String$.$format$("$$$\%\mathrm{.}2$f$",$ costPerDay$))$;

monthlyCostTextField.setText$($String$.$format$("$$$\%\mathrm{.}2$f$",$ monthlyCost$))$;

if $($storageUsed $>$ STORAGE$\_$LIMIT$\_$GB$)\{$

alertTextField.setText$("$Warning: Approaching storage limit$!")$;

$//$ You can also display an alert dialog

Alert alert $=$ new Alert$($Alert$.$AlertType.WARNING$)$;

alert.setTitle$("$Storage Limit Warning"$)$;

alert.setHeaderText$("$Warning: Approaching storage limit$!")$;

alert.setContentText$("$You have exceeded your storage limit of $"+$ STORAGE$\_$LIMIT$\_$GB $+"$ GB$.")$;

alert.showAndWait$()$;

$\}$ else $\{$

alertTextField.clear$()$;

$\}$

$\}$

$\}$

here's the FXML file just incase:

$?$xml version$="1\mathrm{.}0"$ encoding$=$"UTF$-8"?>$