Can you debug this code below?

import java.io$.*$;

import java.util.Scanner;

$//$ Product class to store Id$,$ name, price, and quantity and its getters and

$//$ setters and toString method

class Product $\{$

private int idNum;

private String name;

private double price;

private int quantity;

public Product$($int idNum, String name, double price, int quantity$)\{$

this.idNum $=$ idNum;

this.name $=$ name;

this.price $=$ price;

this.quantity $=$ quantity;

$\}$

public int getID$()\{$

return idNum;

$\}$

public void setId$($int sID$)\{$

idNum $=$ sID;

$\}$

public String getName$()\{$

return name;

$\}$

public void setName$($String sName$)\{$

name $=$ sName;

$\}$

public double getPrice$()\{$

return price;

$\}$

public void setPrice$($double sPrice$)\{$

price $=$ sPrice;

$\}$

public int getQuantity$()\{$

return quantity;

$\}$

public void setQuantity$($int newQuantity$)\{$

quantity $=$ newQuantity;

$\}$

public String toString$()\{$

return String.format$("$ID:$"+$ idNum $+",$ Name:" $+$ name $+",$ Price:" $+$ price $+",$ Quantity:" $+$ quantity$)$;

$\}$

$\}$

$//$ ProductCollection class with all required features

class ProductCollection $\{$

private Product$[]$ collection;

private int count;

int maximumSize;

public ProductCollection$()\{$

maximumSize $=20$;

collection $=$ new Product$[$maximumSize$]$;

count $=0$;

$\}$

public void addProduct$($int prodID, String prodName, double unitPrice, int prodQty$)\{$

if $($count $<$ maximumSize$)\{$

collection$[$count$]=$ new Product$($prodID$,$ prodName, unitPrice, prodQty$)$;

count$++$;

$\}$ else $\{$

increaseSize$()$;

collection$[$count$]=$ new Product$($prodID$,$ prodName, unitPrice, prodQty$)$;

count$++$;

$\}$

$\}$

public void increaseSize$()\{$

maximumSize $=$ maximumSize $*2$;

Product$[]$ prdt $=$ new Product$[$maximumSize$]$;

for $($int i $=0$; i $<$ count; i$++)\{$

prdt$[$i$]=$ collection$[$i$]$;

$\}$

collection $=$ prdt;

$\}$

public int indexOf$($int prodID$)\{$

int flag $=0,$ result $=0$;

for $($int i $=0$; i $<$ count; i$++)\{$

if $($prodID $==$ collection$[$i$].$getID$())\{$

result $=$ i;

flag $=1$;

$\}$

$\}$

if $($flag $==0)$

result $=-1$;

return result;

$\}$

public void changePrice$($int prodID, double newPrice$)\{$

int ind $=$ indexOf$($prodID$)$;

if $($ind $!=-1)$

collection$[$ind$].$setPrice$($newPrice$)$;

$\}$

public void buyProduct$($int prodID, int qty$)\{$

int ind $=$ indexOf$($prodID$)$;

if $($ind $!=-1)$

collection$[$ind$].$setQuantity$($collection$[$ind$].$getQuantity$()+$ qty$)$;

else

System.out.println$("$The product ID is not in the list."$)$;

$\}$

public void sellProduct$($int prodID, int qty$)\{$

int ind $=$ indexOf$($prodID$)$;

if $($ind $!=-1)$

collection$[$ind$].$setQuantity$($collection$[$ind$].$getQuantity$()-$ qty$)$;

else

System.out.println$("$The product ID is not in the list."$)$;

$\}$

public void deleteProduct$($int prodID$)\{$

int ind $=$ indexOf$($prodID$)$;

if $($ind $!=-1)\{$

for $($int i $=$ ind; i $<$ count $-1$; i$++)\{$

collection$[$i$]=$ collection$[$i $+1]$;

$\}$

count$--$;

$\}$ else

System.out.println$("$The product ID is not in the list."$)$;

$\}$

public void displayProduct$($int prodID$)\{$

int ind $=$ indexOf$($prodID$)$;

if $($ind $!=-1)$

System.out.println$("$Product Name:" $+$ collection$[$ind$].$getName$()+",$ Price:" $+$ collection$[$ind$].$getPrice$()+",$ Quantity:" $+$ collection$[$ind$].$getQuantity$())$;

else

System.out.println$("$The product ID is not in the list."$)$;

$\}$

public String createOutputFile$()\{$

try $\{$

File file $=$ new File$("$productUpdate$.$txt$")$;

file.createNewFile$()$;

$\}$ catch $($IOException e$)\{$

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

$\}$

return "productUpdate.txt$"$;

$\}$

public String toString$()\{$

String str $=$ "The products in Collection.

$"$;

for $($int i $=0$; i $<$ count; i$++)\{$

str $=$ str $+$ collection$[$i$].$toString$()$;

str $=$ str $+"$

$"$;

$\}$

return str;

$\}$

$\}$

import java.io$.$BufferedReader;

import java.io$.$FileReader;

import java.util.Scanner;

public class ProgTwo $\{$

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

ProductCollection collection $=$ new ProductCollection$()$;

try $\{$

BufferedReader reader $=$ new BufferedReader$($new FileReader$("$C:$/$Users$/$SHANOOB$/$Desktop$/$product$.$txt$"))$;

String line $=$ reader.readLine$()$;

while $($line $!=$ null$)\{$

String$[]$ arr $=$ line.split$(",")$;

collection.addProduct$($Integer$.$parseInt$($arr$[0]),$ arr$[1],$ Double.parseDouble$($arr$[2]),$ Integer.parseInt$($arr$[3]))$;

line $=$ reader.readLine$()$;