Help with Java program Online Store. Thank you! 1 Objective After completion of

Question

Help with Java program Online Store. Thank you!

1 Objective After completion of this lab, you will be able to: . Define and use several classes for an application. 2 Lab Description In the lab, you will develop three classes called OnlineStore, Product, and Order to keep product information and order information of a tiny online shopping mall. 3 Online Store Class OnlineStore name: String products: Product [] orders: Order I If needed, you can add more variables OnlineStore(String) + addProduct): void + productInfo0: void + makeOrder): void If needed, you can add more methods In the lab, assume that the OnlineStore class can have maximum ten products and ten orders. 4 Product Class Product productNum: int name: String unitPrice: double If needed, you can add more variables. Add methods.

Explanation / Answer

OnlineStoreDemo.java

import java.util.Scanner;

public class OnlineStoreDemo
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner (System.in);
        OnlineStore csumbOnlineStore = new OnlineStore("ABC");
        int option;

        System.out.println("Welcome to ABC OnlineStore");
                
        do
        {
            System.out.println("Select your choice:");
            System.out.println("    1. Add Product");
            System.out.println("    2. Product Info");
            System.out.println("    3. Make Order");
            System.out.println("    4. Exit");
            option = sc.nextInt();
                        
            if (option == 1)      
            {
                csumbOnlineStore.addProduct();
            }
          
            else if (option == 2)
            {
                csumbOnlineStore.productInfo();
            }
          
            else if (option == 3)
            {
                csumbOnlineStore.makeOrder();
            }
            else if (option == 4)
            {
                System.out.println("Bye");
                return;
            }
            else
            {
                System.out.println("Incorrect option");
            }
            System.out.println(" ");
        } while (true);
    }
}

OnlineStore.java

import java.text.DecimalFormat;
import java.util.Scanner;

public class OnlineStore {
       private String name;
       private Product [] products = new Product[10];
       private Order [] orders = new Order [10];
       private int numOfProducts = 0;
       private int numOfOrders = 0;
       private Scanner keyboard = new Scanner(System.in);
      
       OnlineStore(String name)
       {
           this.name = name;
       }
  
       void addProduct()
       {
           if (numOfProducts < 10){
               boolean fail = false;
               Scanner keyboard = new Scanner(System.in);
               int productNum;
               String name;
               double unitPrice;
               System.out.print("Product Numer: ");
               productNum = keyboard.nextInt();
               System.out.print("Product Name: ");
               keyboard.nextLine();
               name = keyboard.nextLine();
               System.out.print("Product Price: ");
               unitPrice = keyboard.nextDouble();
               keyboard.nextLine();
               for (int i = 0; i < numOfProducts; i++){
                   if(products[i].getProductNum() == productNum){
                       System.out.println("Sorry, " + productNum +
                               " already exists!");
                       fail = true;
                       break;
                   }
               }
               if (!fail){
                   DecimalFormat df = new DecimalFormat("0.00");
                   products[numOfProducts] = new Product(productNum, name, unitPrice);
                   System.out.println( "Product Added - " + products[numOfProducts].getname() + ", No: "
                           + products[numOfProducts].getProductNum() + ", Price: " +
                           df.format(products[numOfProducts].getUnitPrice()));
                   numOfProducts++;
               }
           }
           else{
               System.out.println("You already have 10 products");
           }
           }
      
       void productInfo()
       {
           int counter = 1;
           DecimalFormat df = new DecimalFormat("0.00");
           if(numOfProducts == 0)
           {
               System.out.println("There is no products. ");
           }
           for(int i = 0; i < numOfProducts; i ++)
           {
           System.out.println(counter + ". " + products[i].getname() + " (No. " +
                       products[i].getProductNum() + "): $" +
                       df.format(products[i].getUnitPrice()));
           counter++;
           }
       }
       void makeOrder()
       {
           int orderNumber;
           int productNum;
           int counter = 1;
           if(numOfProducts == 0)
           {
               System.out.println("No items to be ordered.");
           }
           System.out.print("Order NUmber: ");
           orderNumber = keyboard.nextInt();
           for(int i = 0; i < numOfProducts; i++)
           {
               System.out.print("Type Product Number (0 to finish) : ");
               productNum = keyboard.nextInt();
               if(products[i].getProductNum() == productNum)
               {
                   orders[numOfOrders] = new Order(orderNumber, products[i]);
                   numOfOrders++;
               }
               else
               System.out.println("Error: Product " + productNum +
                       " does not exist.");
           }
           System.out.println("Order Info - Order Number: " + orderNumber);
           for(int i = 0; i < numOfOrders; i++)
           {
               System.out.println("Item " + counter + ": " + orders[i].getItems());
               counter++;
           }
           System.out.println("Total Price: " + orders[numOfOrders].getTotalPrice());
       }
      
       }

       Order.java

public class Order {
       private int orderNum;
       private double totalPrice = 0;
       private Product [] items = new Product [10];
       private int numOfOrders;
      
       Order( int orderNum, Product items)
       {
           this.orderNum = orderNum;
           this.items[numOfOrders] = items;
       }
      
   public int getOrderNum()
       {
           return orderNum;
       }
   public double getTotalPrice()
       {
          if(numOfOrders == 0)
          {
              totalPrice = items[numOfOrders].getUnitPrice();
          }
           return totalPrice;
       }
   public String getItems()
   {
       return items[numOfOrders].getname() + " (No: " +
               items[numOfOrders].getProductNum() + "): $"
               + items[numOfOrders].getUnitPrice();
   }
}

Product.java

public class Product {
       private int productNum;
       private String name;
       private double unitPrice;
      
       Product(int productNum, String name, double unitPrice)
       {
           this.productNum = productNum;
           this.name =name;
           this.unitPrice = unitPrice;
       }
      
       public int getProductNum()
       {
           return productNum;
       }
      
       public String getname()
       {
           return name;
       }
      
       public double getUnitPrice()
       {
           return unitPrice;
       }
}

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