CustomerManager.java

import java.util.ArrayList;

public class CustomerManager {

    private ArrayList<Customer> customers = new ArrayList<>();

    public ArrayList<Customer> getCustomersList() {
        return customers;
    }

    public void addCustomer(Customer c) {
        if (findCustomer(c.customerID) != null){
            System.out.print("Customer ID already exists. Please enter a unique ID");
            return;
        }
            customers.add(c);
            System.out.print("Customer Added successfully");        
    }

    public void editCustomer(String id, String newName, String newPhone, String newEmail, String newAddress) {
    Customer c = findCustomer(id);
    if (c == null) {
        System.out.println("Customer not found.");
        return;
    }

    c.name = newName;
    c.phoneNumber = newPhone;
    c.email = newEmail;
    c.address = newAddress;

    System.out.println("Customer details updated successfully.");
}

public void deleteCustomer(String id) {
    Customer c = findCustomer(id);
    if (c == null) {
        System.out.println("Customer not found.");
        return;
    }

    customers.remove(c);
    System.out.println("Customer deleted successfully.");
}



    public Customer findCustomer(String id) {
        for (Customer c : customers) {
            if (c.customerID.equals(id)) {
                return c;
            }
        }
        return null;
    }

    public void viewCustomers() {
        if (customers.isEmpty()) {
            System.out.println("No customers found.");
            return;
        }

        System.out.println("\n--- Customers ---");
        for (Customer c : customers) {
            System.out.println(c);
        }
    }
}