static void Main(string[] args)
{
Console.WriteLine("---------- using factory ------------");
var studentFactory = new StudentFactory();
var student = studentFactory.CreateStudent("special");
var student2 = studentFactory.CreateStudent("normal");
Console.WriteLine(student.Speak());
Console.WriteLine(student2.Speak());
Console.WriteLine("------------- using decorator ----------");
var juniorWorker = new JuniorWorker();
juniorWorker.DoWork();
var seniorWorker = new SeniorWorker(juniorWorker);
seniorWorker.DoWork();
Console.WriteLine("-------------- Using singleton -------------");
// instance will be same when used from anywhere
GlobalObject global = GlobalObject.GetInstance();
global.myGlobalList.ForEach(x => Console.WriteLine(x));
global.myGlobalList.Add("Gaurav");
global.myGlobalList.Add("Kapoor");
global.myGlobalList.ForEach(x => Console.WriteLine(x));
Console.WriteLine("---------------Using Adapter ---------------");
ILogger outputLogger = new OutputterAdapter();
var newSystem = new MyNewSystem(outputLogger);
newSystem.Dowork();
Console.WriteLine("----------------Using Template method -------------");
Car myCar = new BMW();
myCar.GetReadyAndDrive();
Console.WriteLine("----------------Using Observer -------------");
Score myScore = new Score();
myScore.AddObserver(new ScoreObserver());
myScore.AddObserver(new SuperScoreObserver());
myScore.Add(5);
myScore.Subtract(3);
}