• Designing a Car Rental System using Java OOPs. I am implementing classes, methods, and encapsulation in the development of the project. • I have successfully developed and implemented a dynamic car rental system that includes features such as renting and returning cars via the console, adding new customers e.t.c
import java.util.ArrayList; import java.util.List; import java.util.Scanner;
class Car { private String carId; private String brand; private String model; private double basePricePerDay; private boolean isAvailable;
public Car(String carId, String brand, String model, double basePricePerDay) {
this.carId = carId;
this.brand = brand;
this.model = model;
this.basePricePerDay = basePricePerDay;
this.isAvailable = true;
}
public String getCarId() {
return carId;
}
public String getBrand() {
return brand;
}
public String getModel() {
return model;
}
public double calculatePrice(int rentalDays) {
return basePricePerDay * rentalDays;
}
public boolean isAvailable() {
return isAvailable;
}
public void rent() {
isAvailable = false;
}
public void returnCar() {
isAvailable = true;
}
}
class Customer { private String customerId; private String name;
public Customer(String customerId, String name) {
this.customerId = customerId;
this.name = name;
}
public String getCustomerId() {
return customerId;
}
public String getName() {
return name;
}
}
class Rental { private Car car; private Customer customer; private int days;
public Rental(Car car, Customer customer, int days) {
this.car = car;
this.customer = customer;
this.days = days;
}
public Car getCar() {
return car;
}
public Customer getCustomer() {
return customer;
}
public int getDays() {
return days;
}
}
class CarRentalSystem { private List cars; private List customers; private List rentals;
public CarRentalSystem() {
cars = new ArrayList<>();
customers = new ArrayList<>();
rentals = new ArrayList<>();
}
public void addCar(Car car) {
cars.add(car);
}
public void addCustomer(Customer customer) {
customers.add(customer);
}
public void rentCar(Car car, Customer customer, int days) {
if (car.isAvailable()) {
car.rent();
rentals.add(new Rental(car, customer, days));
} else {
System.out.println("Car is not available for rent.");
}
}
public void returnCar(Car car) {
car.returnCar();
Rental rentalToRemove = null;
for (Rental rental : rentals) {
if (rental.getCar() == car) {
rentalToRemove = rental;
break;
}
}
if (rentalToRemove != null) {
rentals.remove(rentalToRemove);
} else {
System.out.println("Car was not rented.");
}
}
public void menu() {
Scanner scanner = new Scanner(System.in);
while (true) {
System.out.println("===== Car Rental System =====");
System.out.println("1. Rent a Car");
System.out.println("2. Return a Car");
System.out.println("3. Exit");
System.out.print("Enter your choice: ");
int choice = scanner.nextInt();
scanner.nextLine(); // Consume newline
if (choice == 1) {
System.out.println("\n== Rent a Car ==\n");
System.out.print("Enter your name: ");
String customerName = scanner.nextLine();
System.out.println("\nAvailable Cars:");
for (Car car : cars) {
if (car.isAvailable()) {
System.out.println(car.getCarId() + " - " + car.getBrand() + " " + car.getModel());
}
}
System.out.print("\nEnter the car ID you want to rent: ");
String carId = scanner.nextLine();
System.out.print("Enter the number of days for rental: ");
int rentalDays = scanner.nextInt();
scanner.nextLine(); // Consume newline
Customer newCustomer = new Customer("CUS" + (customers.size() + 1), customerName);
addCustomer(newCustomer);
Car selectedCar = null;
for (Car car : cars) {
if (car.getCarId().equals(carId) && car.isAvailable()) {
selectedCar = car;
break;
}
}
if (selectedCar != null) {
double totalPrice = selectedCar.calculatePrice(rentalDays);
System.out.println("\n== Rental Information ==\n");
System.out.println("Customer ID: " + newCustomer.getCustomerId());
System.out.println("Customer Name: " + newCustomer.getName());
System.out.println("Car: " + selectedCar.getBrand() + " " + selectedCar.getModel());
System.out.println("Rental Days: " + rentalDays);
System.out.printf("Total Price: $%.2f%n", totalPrice);
System.out.print("\nConfirm rental (Y/N): ");
String confirm = scanner.nextLine();
if (confirm.equalsIgnoreCase("Y")) {
rentCar(selectedCar, newCustomer, rentalDays);
System.out.println("\nCar rented successfully.");
} else {
System.out.println("\nRental canceled.");
}
} else {
System.out.println("\nInvalid car selection or car not available for rent.");
}
} else if (choice == 2) {
System.out.println("\n== Return a Car ==\n");
System.out.print("Enter the car ID you want to return: ");
String carId = scanner.nextLine();
Car carToReturn = null;
for (Car car : cars) {
if (car.getCarId().equals(carId) && !car.isAvailable()) {
carToReturn = car;
break;
}
}
if (carToReturn != null) {
Customer customer = null;
for (Rental rental : rentals) {
if (rental.getCar() == carToReturn) {
customer = rental.getCustomer();
break;
}
}
if (customer != null) {
returnCar(carToReturn);
System.out.println("Car returned successfully by " + customer.getName());
} else {
System.out.println("Car was not rented or rental information is missing.");
}
} else {
System.out.println("Invalid car ID or car is not rented.");
}
} else if (choice == 3) {
break;
} else {
System.out.println("Invalid choice. Please enter a valid option.");
}
}
System.out.println("\nThank you for using the Car Rental System!");
}
} public class Main{ public static void main(String[] args) { CarRentalSystem rentalSystem = new CarRentalSystem();
Car car1 = new Car("C001", "Toyota", "Camry", 60.0); // Different base price per day for each car
Car car2 = new Car("C002", "Honda", "Accord", 70.0);
Car car3 = new Car("C003", "Mahindra", "Thar", 150.0);
rentalSystem.addCar(car1);
rentalSystem.addCar(car2);
rentalSystem.addCar(car3);
rentalSystem.menu();
}
}