简单工厂模式的C++、Java实现

 1 Product * SimpleFactory::Create(std::string pStr) {
 2 
 3     if ("ConcreteProductA" == pStr) {
 4         ConcreteProductA cpa;
 5         ConcreteProductA * p = &cpa;
 6         return p;
 7     }
 8     else if ("ConcreteProductB" == pStr) {
 9         ConcreteProductB cpb;
10         ConcreteProductB * p = &cpb;
11         return p;
12     }
13     else {
14         return nullptr;
15     }//end if else
16 
17 }//end method Create

 1 /*简单工厂类*/
 2 public class SimpleFactory {
 3     
 4     //简单工厂方法。
 5     public static Product Create(String pString) {
 6         if (pString.equals("ConcreteProductA")) {
 7             return new ConcreteProductA();
 8         } else if (pString.equals("ConcreteProductB")) {
 9             return new ConcreteProductB();
10         } else {
11             return null;
12         }//end if else
13         
14     }//end method Create
15     
16 }//end class SimpleFactory