package factorymethod;

public class Main {

    public static void main(String[] args) {

        // The client only knows about NotificationSender (the Creator)
        NotificationSender sender;

        sender = new EmailSender();
        sender.notify("alice@example.com", "Your order has shipped!");

        sender = new SmsSender();
        sender.notify("+1-555-0100", "OTP: 482910");

        sender = new PushSender();
        sender.notify("device-token-xyz", "New message from Bob");

        // Adding Slack: just swap the creator. Client code doesn't change.
        sender = new SlackSender();  // new class, nothing else touched
        sender.notify("#alerts", "CPU usage above 90%");
    }
}