OOP Theory

Zoddster

Jul 1st, 2025

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import java.util.*;
interface PaymentMethod {
void processPayment(double amount);
}
class WalletPayment implements PaymentMethod {
public void processPayment(double amount) {
System.out.println("Rs. " + amount + " paid via Wallet.");
}
}
class CardPayment implements PaymentMethod {
public void processPayment(double amount) {
System.out.println("Rs. " + amount + "paid via Card.");
}
}
class CashPayment implements PaymentMethod {
public void processPayment(double amount) {
System.out.println("Rs. " + amount + " paid via Cash-on-Delivery.");
}
}
abstract class User {
protected String name;
protected String email;
protected String password;
public User(String name, String email, String password) {
this.name = name;
this.email = email;
this.password = password;
}
public String getName() {
return name;
}
public String getEmail() {
return email;
}
}
class Customer extends User {
public Customer(String name, String email, String password) {
super(name, email, password);
}
public void placeOrder() {
System.out.println(name + " placed an order.");
}
}
class DeliveryAgent extends User {
private static int count = 0;
private Vehicle vehicle;
public DeliveryAgent(String name, String email, String password, Vehicle vehicle) {
super(name, email, password);
this.vehicle = vehicle;
count++;
}
public static int agentCount() {
return count;
}
public Vehicle getVehicle() {
return vehicle;
}
}
abstract class Vehicle {
protected String type;
public String getType() {
return type;
}
}
class Scooter extends Vehicle {
public Scooter() {
this.type = "Scooter";
}
}
class Bicycle extends Vehicle {
public Bicycle() {
this.type = "Bicycle";
}
}
class FoodItem {
private String itemName;
private double price;
private String category;
public FoodItem(String itemName, double price, String category) {
this.itemName = itemName;
this.price = price;
this.category = category;
}
public String getItemName() {
return itemName;
}
public double getPrice() {
return price;
}
public String getCategory() {
return category;
}
}
class Order {
private List<FoodItem> foodItems;
private Customer customer;
private DeliveryAgent deliveryAgent;
private Date orderTime;
private double totalAmount;
private String deliveryAddress;
public Order(List<FoodItem> foodItems, Customer customer, DeliveryAgent deliveryAgent, String deliveryAddress) {
this.foodItems = foodItems;
this.customer = customer;
this.deliveryAgent = deliveryAgent;
this.deliveryAddress = deliveryAddress;
this.orderTime = new Date();
calculatePrice();
}
public void calculatePrice() {
totalAmount = 0;
for (FoodItem item : foodItems) {
totalAmount += item.getPrice();
}
}
public double getTotalAmount() {
return totalAmount;
}
public void printSummary() {
System.out.println("Customer: " + customer.getName());
System.out.println("Delivery Rider: " + deliveryAgent.getName() + " (" + deliveryAgent.getVehicle().getType() + ")");
System.out.println("Address: " + deliveryAddress);
System.out.println("Time: " + orderTime);
System.out.println("\n");
for (FoodItem item : foodItems) {
System.out.println("- " + item.getItemName() + " (" + item.getCategory() + ") Rs. " + item.getPrice());
}
System.out.println("Total Amount: Rs. " + totalAmount);
}
}
interface OrderService {
void placeOrder();
void cancelOrder();
void completeOrder();
}
class OrderManager implements OrderService {
private List<Order> orderList = new ArrayList<>();
public void addOrder(Order order) {
orderList.add(order);
placeOrder();
}
public void placeOrder() {
System.out.println("Order placed.");
}
public void cancelOrder() {
System.out.println("Order cancelled.");
}
public void completeOrder() {
System.out.println("Order delivered.");
}
}
public class FoodDeliverySystem {
public static void main(String[] args) {
Customer customer = new Customer("LightYagami", "[email protected]", "Note666");
DeliveryAgent agent = new DeliveryAgent("Saim", "[email protected]", "Zodd", new Scooter());
List<FoodItem> items = new ArrayList<>();
items.add(new FoodItem("Cheese Burger", 350, "Fast-Food"));
items.add(new FoodItem("Mayo Fries", 150, "Side"));
Order order = new Order(items, customer, agent, "Street 69-C, Hyderabad");
order.printSummary();
PaymentMethod payment = new CardPayment();
payment.processPayment(order.getTotalAmount());
OrderManager manager = new OrderManager();
manager.addOrder(order);
manager.completeOrder();
}
}

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