Program.cs

namespace Internship
{
    class Program
    {

        static void Main(string[] args)
        {
            // OOP oop = new OOP();
            // oop.oopDemo();

            // Generics generics = new Generics();
            // generics.genericsDemo();

            // SimpleFactoryDemo factory = new SimpleFactoryDemo();
            // FactoryMethodDemo factory = new FactoryMethodDemo();
            // AbstractFactoryDemo factory = new AbstractFactoryDemo();
            // factory.designPatternDemo();

            // FactoryExample example = new FactoryExample();
            // example.designPatternDemo();

            // SingletonDemo singletonDemo = new SingletonDemo();
            // singletonDemo.designPatternDemo();

            // BuilderDemo builderDemo = new BuilderDemo();
            // builderDemo.designPatternDemo();

            // DecoratorDemo decoratorDemo = new DecoratorDemo();
            // decoratorDemo.designPatternDemo();

            // FacadeDemo facadeDemo = new FacadeDemo();
            // facadeDemo.designPatternDemo();

            // ObserverDemo observerDemo = new ObserverDemo();
            // observerDemo.designPatternDemo();

            // ObserverExample example = new ObserverExample();
            // example.designPatternDemo();

            // ShoppingCartSystem shop = new ShoppingCartSystem();
            // shop.ManageCartSystem();

            BallGameDemo ballGame = new BallGameDemo();
            ballGame.Start();
        }
    }
}