static void Main(string[] args)
{
IWorker worker = new GoodWorker();
worker.DoWork();
IWorker lazyworker = new LazyWorker();
lazyworker.DoWork();
Console.ReadKey();
}
public void DoWork()
{
Console.WriteLine($"\nLazy work got a new task.");
if (this._worker == null)
{
this._worker = new GoodWorker();
}
this._worker.DoWork();
}