设计模式之 简单工厂模式

interface Product {

    

}



class Product1 implements Product{



}



class Product2 implements Product{



}



public class SimpleFactory {

    public static Product createProduct(String productname) {

        if (productname == "1") {

            return new Product1();

        } else if (productname == "2") {

            return new Product2();

        } else {

            return null;

        }

    }

}