I am trying to get this code to read a CSV file instead of a normal txt file. I believe I implemented the code to read the CSV file wrong. Any help would be great, as well as the code being fixed.

import java.io$.$BufferedReader;

import java.io$.$File;

import java.io$.$FileReader;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Locale;

import java.util.Scanner;

$//$ Item class

public class HW$4\{$

$//$ Arrays to store data

public int$[]$ itemCode;

public String$[]$ itemName;

public float$[]$ unitPrice;

$//$ Item constructor

HW$4()\{$

String$[]$ data $=$ new String$[0]$;

$//$ Reading file

data $=$ this.readFile$($data$)$;

$//$ Getting data

itemCode $=$ new int$[$data$.$length$]$;

itemName $=$ new String$[$data$.$length$]$;

unitPrice $=$ new float$[$data$.$length$]$;

for$($int i $=0$;i $$ data.length;i$++)\{$

String$[]$ dataDivided $=$ data$[$i$].$split$(",")$;

itemCode$[$i$]=$ Integer.parseInt$($dataDivided$[0])$;

itemName$[$i$]=$ dataDivided$[1]$;

unitPrice$[$i$]=$ Float.parseFloat$($dataDivided$[2])$;

$\}$

$\}$

$//$ Reading files from the source provided

List$>$ records $=$ new ArrayList;

try $($BufferedReader br $=$ new BufferedReader$($new FileReader$("$book$.$csv$")))\{$

String line;

while $(($line $=$ br$.$readLine$())!=$ null$)\{$

String$[]$ values $=$ line.split$($COMMA$\_$DELIMITER$)$;

records.add$($Arrays$.$asList$($values$))$;

$\}$

$\}$

$//$ GetName function

public String getName$($int code$)\{$

return itemName$[$code$-1]$;

$\}$

$//$ GetPrice function

public double getPrice$($int code$)\{$

return unitPrice$[$code $-1]$;

$\}$

$\}$

$//$ Driver's Class

public class OnlineSale $\{$

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

$//$ creating scanner class object

Scanner sc $=$ new Scanner$($System$.$in$)$;

$//$ Variables to store data

String$[]$ data $=$ new String$[100]$;

int count $=0$;

int code;

double totalDataCode $=0$;

double sales $=0$;

System.out.println$("$Beginning a new sale $($Y$/$N$)")$;

String ans $=$ sc$.$next$()$;

while$($ans$.$toLowerCase$($Locale$.$ROOT$).$equals$("$y$"))\{$

if $($ans$.$toLowerCase$($Locale$.$ROOT$).$equals$("$y$"))\{$

do $\{$

HW$4$ n$1=$ new HW$4()$;

System.out.print$("$Enter product code: $")$;

String value$1=$ sc$.$next$()$;

$//$ Checking whether input is correct or not

while$($value$1.$charAt$(0)<mtext></mtext><mn>4</mn><mn>8</mn><mtext></mtext><mi>|</mi><mi>|</mi>$ value$1.$charAt$(0)>57)\{$

System.out.println$("!!!$Invalid product code"$)$;

System.out.print$("$Enter product code: $")$;

value$1=$ sc$.$next$()$;

$\}$

code $=$ Integer.parseInt$($value$1)$;

if $($code $==-1)\{$

continue;

$\}$

System.out.println$("$ item name: $"+$ n$1.$getName$($code$))$;

String itemName $=$ n$1.$getName$($code$)$;

double price $=$ n$1.$getPrice$($code$)$;

System.out.print$("$Enter quantity: $")$;

value$1=$ sc$.$next$()$;

while$($value$1.$charAt$(0)<mtext></mtext><mn>4</mn><mn>8</mn><mtext></mtext><mi>|</mi><mi>|</mi>$ value$1.$charAt$(0)>57)\{$

System.out.println$("!!!$Invalid quantity :$")$;

System.out.print$("$Enter quantity code: $")$;

value$1=$ sc$.$next$()$;

$\}$

int quantity $=$ Integer.parseInt$($value$1)$;

double total $=$ quantity $*$ price;

System.out.println$("$Item Total : $ $"+$ total$)$;

totalDataCode $=$ totalDataCode $+$ total;

data$[$count$]=$ quantity $+""+$ itemName $+"$ $$"+$ String.format$("\%\mathrm{.}2$f$",$ total$)$;

count$++$;

$\}$ while $($code $!=-1)$;

System.out.println$("---------------------------")$;

System.out.println$("$Item List :$")$;

for $($String datum : data$)\{$

if$($datum$!=$null$)\{$

System.out.println$($datum$)$;

$\}$

$\}$

System.out.println$("$SubTotal $$"+$ totalDataCode$)$;

double totalWithTax $=$ totalDataCode $+$ totalDataCode $*6/100$;

System.out.println$("$Total with tax $"+$ String.format$("\%\mathrm{.}2$f$",$ totalWithTax$))$;

System.out.print$("$Tendered Amount : $ $")$;

double amountPay $=$ Double.parseDouble$($sc$.$next$())$;

while $($true$)\{$

if $($totalWithTax $-$ amountPay $>0)\{$

System.out.println$("$Enter tendered amount again."$)$;