Question & Answer: You are required to implement the Make Order Request use case for the on-line shopping system using an object-orient langauge (C++, C#, o…..

Solution=================================

import java.util.ArrayList;
import java.util.Scanner;

class Bank{

//Dummy Cards and balances
private String cards[]={
“1234567890”,”2345678901″,”135792469″
};
double balances[]={300,100,50.50};

private static int authNumCounter=707707;

//A card is authorized if it exists, and has sufficient balance
boolean isCardAuthorized(String cardNo, double amount){
for(int i=0;i<cards.length;i++){
if(cards[i].equals(cardNo)){
if(balances[i]>=amount){
return true;
}
}
}

return false;
}

public String getAuthNum(String creditcard,double amount) {
if(!isCardAuthorized(creditcard,amount)){
return String.valueOf(authNumCounter++);
}

return null;
}

}

class Customer{

ArrayList<Order>orderHistory;
Order currentOrder;
static int customerIdCounter=1001;
int customerId;

public Customer(String order){
orderHistory=new ArrayList<>();

currentOrder=new Order(order);
customerId=customerIdCounter;
customerIdCounter++;
}

public Order getCurrentOrder(){
return currentOrder;
}

}

//The main controller
class SystemController{

//Delivery order
class DeliveryOrder{
Order order;
int CustomerId;
String creditCardAuthNumber;

public DeliveryOrder(Order order, int customerId, String creditCardAuthNumber) {
this.order = order;
CustomerId = customerId;
this.creditCardAuthNumber = creditCardAuthNumber;
}
}

//List of all customers who have an account and delivery orders
ArrayList<Customer> registeredCustomers;
ArrayList<DeliveryOrder> deliveryOrders;
Bank bank;

public SystemController(){
registeredCustomers=new ArrayList<>();
deliveryOrders=new ArrayList<>();
bank = new Bank();
}

//Check if customer already have an account
boolean isCustomerRegistered(Customer cust){
for(Customer c:registeredCustomers){
if(c==cust) return true;
}
return false;
}

//Main logic
public void placeOrder(Customer cust, String creditcard)
{
Scanner in = new Scanner(System.in);
//If customer has no account prompt him to make one,or cancel order
if(!isCustomerRegistered(cust)){
System.out.println(“New User? Register(R) to continue..n Or Cancel(C) order: “);
String choice=in.nextLine().trim();
System.out.println(choice);

if(choice.equals(“R”)){
registerCustomer(cust);
System.out.println(“You are now registerd with us!! nPlease Wait…”);
}else{
System.out.println(“Your order has been cancelled”);
return;
}
}

//Prompt The right card number, until the Customer either cancels order or provides
//The correct card info
while(!bank.isCardAuthorized(creditcard, cust.getCurrentOrder().getTotalAmount())){
System.out.println(“Please enter the correct card, or Cancel(C) the order: “);
String input = in.nextLine().trim();

if(input.equals(“C”)) return;

creditcard=input;
}

in.close();
Order currentOrder=cust.getCurrentOrder();
String authNum=bank.getAuthNum(creditcard,currentOrder.getTotalAmount());

//Creating a Delivery Order, and storing it for record
DeliveryOrder o = new DeliveryOrder(cust.getCurrentOrder(),cust.customerId,authNum);
deliveryOrders.add(o);

//Displaying Order Summary
System.out.println(“Purchase Approved! Order Summary:”);
currentOrder.displayOrder();
System.out.println(“Total Amount: “+currentOrder.getTotalAmount());
}

public void registerCustomer(Customer cust){
registeredCustomers.add(cust);
}

}

class Order{
//Some fictional order items, and their associated prices
static final String items[] = {“A”,”B”,”C”,”D”};
static final double price[] ={10,15,11.50,170};

//Quantity chosen per item
int qty[]={0,0,0,0};
double totalCost;

//For simplicity order comes
//In the format of 4A-0B-3C-0D
public Order(String orders){
String[] data=orders.split(“-“);
for(int i=0;i<items.length;i++){
qty[i]=Character.getNumericValue(data[i].charAt(0));
}

//Calculating total Cost
totalCost=0;
for(int i=0;i<qty.length;i++){
totalCost+=(qty[i]*price[i]);
}
}

public double getTotalAmount(){
return totalCost;
}

public void displayOrder(){
System.out.println(“Item    Quantity    PricePerUnit”);
for(int i=0;i<qty.length;i++){
if(qty[i]!=0){
System.out.println(items[i]+”        “+qty[i]+”      “+price[i]);

}
}
}

}
public class PurchaseController {

public static void main(String[] args) {

SystemController sc = new SystemController();
Customer cust = new Customer(“1A-9B-2C-0D”);
sc.placeOrder(cust, “00000000”);

}

}

Output===============