Question

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 number of specific products available for sale).

Requirements:

• 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.

Grading details:

• Correct usage of OOP concepts (80%)

  • Correct class design and usage of class instances (30%)

  • Correct implementation and usage of polymorphism (30%)

  • Other supporting code/logic (20%)

• Program runs/correct results (10%)

• Formatting/Indentation (10%)

Starter code:

import java.util.ArrayList; public class RetailInventory { static ArrayList 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); addNewProduct(computer); addNewProduct(iPhone); addNewProduct(Galaxy10); addNewProduct(book); addNewProduct(apple); viewInventoryDetails(); viewLowStock(); } } // You will need to add more methods to this file

Product:

public class Product {

    private String name;

    private String description;

    private double wholeSalePrice;

    private double retailPrice;

    public Product() {//default constructor



    }

    public Product(String name, double wholeSalePrice) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

    }

    public Product(String name, double       wholeSalePrice, double retailPrice) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

        this.retailPrice=retailPrice;

    }

    public Product(String name, double       wholeSalePrice, double retailPrice, String description) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

        this.retailPrice=retailPrice;

        this.description=description;

    }



    private double getRetailPrice() {//this method will return the retailPrice as per the sample outpu



        retailPrice= wholeSalePrice+(wholeSalePrice*.10);//output shows that retailPrice is 10% addition to wholesaleprice

        return retailPrice;

    }



    public String toString() {//print object details

        if(description==null) {//if description is null, then print a message for description

            return "\nname: "+name+" , description: No description entererd., wholesalePrice: $"+wholeSalePrice+", retailPrice $"+getRetailPrice();

        }

        else {//otherwise print description value

            return "\nname: "+name+" , description: "+description+", wholesalePrice: $"+wholeSalePrice+", retailPrice $"+getRetailPrice();

        }//end else

    }//end toString

}//end class

Book:

public class Book extends Product {



    private String author;



    public Book(String name, double wholeSalePrice) {// constructor gets name , price

        super(name, wholeSalePrice);//pass the name and price to the super class product

        author="Author_Placeholder";

    }

    public String toString() {

        return super.toString()+", Author: "+author;//super will return the product details and author is added here

    }//end toString

}//end class

Food:

public class Food extends Product {

    private String date;

    public Food(String name, double wholeSalePrice, String date) { // constructor gets name , price and date

        super(name, wholeSalePrice);//pass name and wholesale price to super class

        this.date = date;//set date for local class instance variable date

    }

    public String toString() {//return the food details

        return super.toString() + ", expiration: " + date;
    }
}

Sample output:

Viewing Store Products:

name: Computer, description: No description entered., wholesalePrice: $1400.00, retailPrice: $1540.00, stock: 3

name: iPhone XR, description: No description entered., wholesalePrice: $400.00, retailPrice: $440.00, stock: 6

name: Samsung Galaxy S10, description: Phone with 128GB memory., wholesalePrice: $700.00, retailPrice: $770.00, stock: 8

name: Starting out with C++, description: No description entered., wholesalePrice: $150.00, retailPrice: $165.00, stock: 3, author: Author_Placeholder

name: Fuji Apples, description: No description entered., wholesalePrice: $3.50, retailPrice: $3.85, stock: 150, expiration: Dec. 1, 2019

Viewing items that need to be re-stocked:

name: Computer, description: No description entered., wholesalePrice: $1400.00, retailPrice: $1540.00, stock: 3

name: Starting out with C++, description: No description entered., wholesalePrice: $150.00, retailPrice: $165.00, stock: 3, author: Author_Placeholder

Answer 1

HI,

I just updated two classess, rest are same.i didnt updateed Book.java and Food.java.

Updated classes are below:

Product.java:

// You will need to add more methods to this file

public class Product {

    private String name;

    private String description;

    private double wholeSalePrice;

    private double retailPrice;

    private int stock=0;

    public Product() {//default constructor



    }

    public Product(String name, double wholeSalePrice) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

    }

    public Product(String name, double       wholeSalePrice, double retailPrice) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

        this.retailPrice=retailPrice;

    }

    public Product(String name, double       wholeSalePrice, double retailPrice, String description) {//constructor with name and price

        this.name = name;//set the instance variables as per the value passed

        this.wholeSalePrice= wholeSalePrice;

        this.retailPrice=retailPrice;

        this.description=description;

    }



    private double getRetailPrice() {//this method will return the retailPrice as per the sample outpu



        retailPrice= wholeSalePrice+(wholeSalePrice*.10);//output shows that retailPrice is 10% addition to wholesaleprice

        return retailPrice;

    }

        public int getStock(){
           return stock ;
        }

        public void setStock(int stock){
            this.stock = stock ;
        }

        public String getName(){
           return name ;
        }

        public void setName(String name){
            this.name = name ;
        }



    public String toString() {//print object details

        if(description==null) {//if description is null, then print a message for description

            return "\nname: "+name+" , description: No description entererd., wholesalePrice: $"+wholeSalePrice+", retailPrice $"+getRetailPrice()+", stock: "+getStock();

        }

        else {//otherwise print description value

            return "\nname: "+name+" , description: "+description+", wholesalePrice: $"+wholeSalePrice+", retailPrice $"+getRetailPrice()+", stock: "+getStock();

        }//end else

    }//end toString

}//end class

RetailInventory.java

import java.util.ArrayList;

public class RetailInventory {

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

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");


addNewProduct(computer);
addNewProduct(iPhone);
addNewProduct(Galaxy10);
addNewProduct(book);
addNewProduct(apple);


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



viewInventoryDetails();

viewLowStock();
}//end of main

public static void addNewProduct(Product p){
      inventory.add(p);
      
}

public static void updateStock(Product p, int quantity){
       
                p.setStock(quantity);
       
      
}

public static void viewInventoryDetails(){
          System.out.println("\nView store products: ");
     
      for (Product prod : inventory) {                
              System.out.println(prod);                 
      }
}

public static void viewLowStock(){
       System.out.println("\nView low stock: ");
                for (Product prod : inventory) { 
                        if(prod.getStock()<5)
              System.out.println(prod);                 
      }
       
      
}


} //end of class

Output: output is as expected.

Thanks