Problem statement:

You are tasked with writing a simple program that will keep track of items sold by a retail store. We need to keep track of the stock (or a number of specific products available for sale).

The program will now be broken up into methods and store all the inventory in an ArrayList object.
The program will be able to run a report for all inventory details as well as a report for items that are low in stock. Low stock means that there are less than 5 items available for sale.

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import java.util.ArrayList;

public class RetailInventory {

    static ArrayList<Product> inventory = new ArrayList<>();

    public static void main(String[] args) {
       Product computer = new Product("Computer", 1400);
       Product iPhone = new Product("iPhone XR", 400, 600);
       Product Galaxy10 = new Product("Samsung Galaxy S10", 700, 900, "Phone with 128GB memory.");
       Product book = new Book("Starting out with C++", 150.00);
       Product apple = new Food("Fuji Apples", 3.50, "Dec. 1, 2019");

       updateStock(computer, 3);
       updateStock(iPhone, 6);
       updateStock(Galaxy10, 8);
       updateStock(book, 3);
       updateStock(apple, 150);



    * this function update the value of stock
    * @param obj
    * @param stock
    public static void updateStock(Product obj , int stock){

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