Simple ordering system
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In this project a simple ordering system is implemented in which the user has a shopping menu displayed with the following:
- Main menu:
Pizza, $40
Cheeseburger, $20
Coffee, $5
Soda, $4
Water, $2
- Takes input from the user that represents each item and its quantity.
- Adds the items with their quantities to the user’s shopping cart.
- On checkout, takes input from the user representing their payment method (PayPal or CreditCard).
- Calculates and displays the amount of the order to the user and performs the payment using the method determined by the user and displays a confirmation message of the payment status (success or failure).
- UML diagram
- JOptionPane is used for the GUI to display and take inputs from the user
- Added abstract classes
- Added polymorphism
- Added screenshots of the run
package project;
import javax.swing.JOptionPane;
import java.util.Date;
public class MyClass {
public static void main(String[] args) {
String purchase;
PaymentMethod PaymentMethod; // polymorphism
ShoppingCart cart = new ShoppingCart();
do {
String name = JOptionPane.showInputDialog("Please, select a product:\n- Pizza, $40 \n- Cheeseburger, $20\n- Coffee, $5\n- Soda, $4\n- Water, $2\n" + "\nEnter item’s name ");
double price = Double.parseDouble(JOptionPane.showInputDialog("Please, select a product:\n- Pizza, $40 \n- Cheeseburger, $20\n- Coffee, $5\n- Soda, $4\n- Water, $2\n" + "\nEnter item’s Price "));
int quantity = Integer.parseInt(JOptionPane.showInputDialog("Please, select a product:\n- Pizza, $40 \n- Cheeseburger, $20\n- Coffee, $5\n- Soda, $4\n- Water, $2\n" + "\nEnter item’s Quantity "));
Item item = new Item(name, quantity, price);
cart.add(item);
String discountInput = JOptionPane.showInputDialog("Do you have discount? (Y/N)");
if (discountInput.equals("Y") || discountInput.equals("y")) {
int discountAmount = Integer.parseInt(JOptionPane.showInputDialog("Enter Discount Percentage"));
item.setPrice(price, discountAmount);
}
purchase = JOptionPane.showInputDialog("Proceed to checkout (Y/N)");
} while (purchase.equals("N") || purchase.equals("n"));
String choice = JOptionPane.showInputDialog("choose a payment method (PayPal or CreditCard)");
if (choice.equals("Paypal") || choice.equals("paypal") || choice.equals("PayPal")) {
String email = JOptionPane.showInputDialog("Enter Email ");
String Password = JOptionPane.showInputDialog("Enter Password ");
int balance = Integer.parseInt(JOptionPane.showInputDialog("Enter Balance"));
PaymentMethod = new PayPal(email, Password); //polymorphism
((PayPal) PaymentMethod).setBalance(balance);
if (PaymentMethod.isValid()) {
JOptionPane.showMessageDialog(null, "Valid", "PaymentMethod", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "InValid", "PaymentMethod", JOptionPane.INFORMATION_MESSAGE);
}
} else {
String name = JOptionPane.showInputDialog("Enter cardName ");
String cardNumber = JOptionPane.showInputDialog("Enter cardNumber ");
int cvv = Integer.parseInt(JOptionPane.showInputDialog("Enter cvv"));
int year = Integer.parseInt(JOptionPane.showInputDialog("Enter expiryDate (year)"));
int month = Integer.parseInt(JOptionPane.showInputDialog("Enter expiryDate (month)"));
int day = Integer.parseInt(JOptionPane.showInputDialog("Enter expiryDate (day)"));
Date expiryDate = new Date(year - 1900, month - 1, day);
int Balance = Integer.parseInt(JOptionPane.showInputDialog("Enter Balance"));
PaymentMethod = new CreditCard(name, cardNumber, cvv, expiryDate);
((CreditCard) PaymentMethod).setBalance(Balance);
if (PaymentMethod.isValid()) {
JOptionPane.showMessageDialog(null, "Valid", "PaymentMethod", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "InValid", "PaymentMethod", JOptionPane.INFORMATION_MESSAGE);
}
}
JOptionPane.showMessageDialog(null, cart.checkout(PaymentMethod), "CheckOut", JOptionPane.INFORMATION_MESSAGE);
String display = JOptionPane.showInputDialog("DO you want to see what's in your cart? (Y/N)");
if (display.equals("Y") || display.equals("y")) {
cart.display();
}
}
}
package project;
public class Item
{
private String name;
private int quantity;
private double price;
public static int count = 0;
Item(String name,int quantity,double price)
{
this.name=name;
this.quantity=quantity;
this.price=price;
count++;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public void setPrice(double price) {
this.price = price;
}
public void setPrice(double price, int discountPercent) {
this.price = ((price * discountPercent) / 100); // OverLoading
}
public double getPrice() {
return price;
}
}
package project;
public interface PaymentMethod {
public boolean isValid();
public String pay(int amount);
}
package project;
import java.util.regex.*;
import javax.swing.JOptionPane;
public class PayPal implements PaymentMethod {
private String email, password;
private int balance;
PayPal(String email, String password) {
this.email = email;
this.password = password;
balance = 0;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getBalance() {
return balance;
}
public void setBalance(int balance) {
this.balance = balance;
}
@Override
public boolean isValid() {
//email
String emailRegex = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,6}$";
Pattern emailPattern = Pattern.compile(emailRegex);
Matcher emailMatcher = emailPattern.matcher(email);
//password
String passwordRegex = "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}$";
Pattern passwordPattern = Pattern.compile(passwordRegex);
Matcher passwordMatcher = passwordPattern.matcher(password);
return (emailMatcher.matches() && passwordMatcher.matches());
}
@Override
public String pay(int amount) {
if (isValid() && amount <= balance) {
balance -= amount;
return "Successful Remaining balance = " + balance;
} else {
return "failed";
}
}
}
package project;
import java.util.Date;
public class CreditCard implements PaymentMethod {
private String cardName, cardNumber;
private int cvv, balance;
private Date expiryDate;
CreditCard(String cardName, String cardNumber, int cvv, Date expiryDate) {
balance = 0;
this.cvv = cvv;
this.cardName = cardName;
this.expiryDate = expiryDate;
}
public String getCardName() {
return cardName;
}
public void setCardName(String cardName) {
this.cardName = cardName;
}
public String getCardNumber() {
return cardNumber;
}
public void setCardNumber(String cardNumber) {
this.cardNumber = cardNumber;
}
public int getCvv() {
return cvv;
}
public void setCvv(int cvv) {
this.cvv = cvv;
}
public int getBalance() {
return balance;
}
public void setBalance(int balance) {
this.balance = balance;
}
public Date getExpiryDate() {
return expiryDate;
}
public void setExpiryDate(Date expiryDate) {
this.expiryDate = expiryDate;
}
@Override
public boolean isValid() {
Date CurrentDate = new Date();
return expiryDate.after(CurrentDate);
}
public String pay(int amount) {
if (isValid() && balance >= amount) {
balance -= amount;
return "Successful Remaining balance = " + balance;
} else {
return "failed";
}
}
}
package project;
public abstract class Display {
public abstract void display();
}
package project;
import javax.swing.JOptionPane;
import java.util.ArrayList;
public class ShoppingCart extends Display {
ArrayList<Item> orderItems;
public ShoppingCart() {
orderItems = new ArrayList<>(); // composition relationship
}
public void add(Item item) {
if (orderItems.size() < 10) {
orderItems.add(item);
} else {
JOptionPane.showMessageDialog(null, "Error", "Add Item", JOptionPane.INFORMATION_MESSAGE);
}
}
public void remove(Item item) {
if (!orderItems.isEmpty() && orderItems.contains(item)) {
orderItems.remove(item);
} else {
JOptionPane.showMessageDialog(null, "Error", "remove Item", JOptionPane.INFORMATION_MESSAGE);
}
}
public double getTotalAmount() {
double total = 0;
for (int i = 0; i < orderItems.size(); i++) {
total += (orderItems.get(i).getPrice()) * (orderItems.get(i).getQuantity());
}
return total;
}
public String checkout(PaymentMethod paymentMethod) {
JOptionPane.showMessageDialog(null, "number of items in your Cart = " + Item.count + " And Your TotalAmount = " + getTotalAmount(), "Checkout", JOptionPane.INFORMATION_MESSAGE);
return paymentMethod.pay((int) getTotalAmount());
}
@Override
public void display() // Override (Abstract class)
{
for (int i = 0; i < orderItems.size(); i++) {
JOptionPane.showMessageDialog(null, "item in index (" + (i + 1) + ") :\n" + "item’s name:" + orderItems.get(i).getName() + "\n" + "item’s price :" + orderItems.get(i).getPrice() + "\n" + "item’s Quantity :" + orderItems.get(i).getQuantity(), "Display", JOptionPane.INFORMATION_MESSAGE);
}
}
}
Any contributions you make are greatly appreciated.
Project Link: https://github.com/ahmeddwalid/OOP-project
This project is distributed under the MIT License. See
LICENSE.txt for more information.
Ahmed Walid
Ahmed Mohamed
Alsayed Aly
- Java Documentation
- Mohaned ElDeeb get in touch