Program.cs

using Lab2.Patterns.AbstractFactory;
using Lab2.Patterns.Builder;
using Lab2.Patterns.FactoryMethod;
using Lab2.Patterns.Prototype;
using Lab2.Patterns.Singleton;

Console.OutputEncoding = System.Text.Encoding.UTF8;

Console.WriteLine("Завдання 1. Фабричний метод");
var creators = new List<SubscriptionCreator>
{
    new WebSite(),
    new MobileApp(),
    new ManagerCall()
};

foreach (var creator in creators)
{
    foreach (SubscriptionType type in Enum.GetValues<SubscriptionType>())
    {
        var subscription = creator.CreateSubscription(type);
        Console.WriteLine($"{creator.ChannelName} -> {subscription}");
    }
}

Console.WriteLine("Завдання 2. Абстрактна фабрика");
var deviceFactories = new IDeviceFactory[]
{
    new IProneFactory(),
    new KiaomiFactory(),
    new BalaxyFactory()
};

foreach (var factory in deviceFactories)
{
    var devices = new IDevice[]
    {
        factory.CreateLaptop(),
        factory.CreateNetbook(),
        factory.CreateEBook(),
        factory.CreateSmartphone()
    };

    Console.WriteLine(factory.BrandName);
    foreach (var device in devices)
    {
        Console.WriteLine(device.GetFullDescription());
    }
}

Console.WriteLine("Завдання 3. Одинак");
var authenticatorFromMain = Authenticator.Instance;
var authenticatorFromTask = await Task.Run(() => Authenticator.Instance);
Console.WriteLine($"Main hash: {authenticatorFromMain.GetHashCode()}");
Console.WriteLine($"Task hash: {authenticatorFromTask.GetHashCode()}");
Console.WriteLine($"Один екземпляр: {ReferenceEquals(authenticatorFromMain, authenticatorFromTask)}");
Console.WriteLine(authenticatorFromMain.Authenticate("student", "kpz-2026")
    ? "Автентифікація успішна."
    : "Автентифікація неуспішна.");

Console.WriteLine("Завдання 4. Прототип");
var familyRoot = VirusSamples.CreateFamily();
var clonedFamily = (Virus)familyRoot.Clone();
Console.WriteLine("Оригінал:");
Console.WriteLine(familyRoot.ToTreeString());
Console.WriteLine("Клон:");
Console.WriteLine(clonedFamily.ToTreeString());
Console.WriteLine($"Кореневий об'єкт спільний: {ReferenceEquals(familyRoot, clonedFamily)}");
Console.WriteLine($"Перша дитина спільна: {ReferenceEquals(familyRoot.Children[0], clonedFamily.Children[0])}");

Console.WriteLine("Завдання 5. Будівельник");
var director = new CharacterDirector();
var dreamHero = director.CreateDreamHero(new HeroBuilder());
var worstEnemy = director.CreateArchEnemy(new EnemyBuilder());
Console.WriteLine(dreamHero);
Console.WriteLine();
Console.WriteLine(worstEnemy);