2. Using object oriented programming approach, write a program to calculate the purchase price for a retail store. -Define a class Productl (Product1.java) o Four private data members: product number, product name, unit price, units sold o Two overloaded constructors o Get and set methods for each private data member o A method to calculate and return the purchase price (unit price * units sold) o toString0 method -(Store.java) Write a client program that creates a Product1 object based on the user input, computes the purchase price, and outputs the sales information (include the item id, item name, unit price, units sold, and purchase price