1.委托
所谓委托通俗一点就是 把方法当作变量来传参
下面根据网上的例子来分析，接口替代委托
2.PizzaFactory 和ToyCarFactory是引用接口下面的方法
3.WrapProduct就是接口代替委托的方法，把接口传入至此
个人总结:java就是纯接口没有用委托，个人感觉接口比较更容易理解。

 class Program {
        static void Main(string[] args) {
            var pizzaFactory=new PizzaFactory();
            var toycarFactory=new ToyCarFactory();
            var wrapFactory=new WrapFactory();

            var box1 = wrapFactory.WrapProduct(pizzaFactory);//方法传参
            var box2 = wrapFactory.WrapProduct(toycarFactory);//方法传参

            Console.WriteLine(box1.Prouduct.Name);
            Console.WriteLine(box2.Prouduct.Name);
        }
    }
    interface IProductFactory {
        Prouduct Make();
    }
    class PizzaFactory : IProductFactory {
        public Prouduct Make() {
            var product = new Prouduct();
            product.Name = "Pizza";
            return product;
        }
    }
    class ToyCarFactory : IProductFactory {
        public Prouduct Make() {
           var product=new Prouduct();
            product.Name = "ToyCar";
            return product;
        }
    }
    class Prouduct {
        public string Name { get; set; }
    }
    class Box {
        public Prouduct Prouduct { get; set; }
    }
    class WrapFactory {
        public Box WrapProduct(IProductFactory productFactory) {
            Box box = new Box();
            var product = productFactory.Make();
            box.Prouduct = product;
            return box;
        }
    }
}