设计模式DP(1)工厂方法

设计模式DP(1)工厂方法FactoryMethod

特点：一个类的实例化具体到让子类去实例化

           根据不同的类型，实例化特定的接口

           向上兼容性

代码：

##定义任务工作接口

   public interface IWork{

         public void  doWork();

   }

public class FatherWork implements IWork{

       public void doWork(){

              System.out.println("Father do work");

       }

}

public class SonWork implements IWork{

       public void doWork(){

              System.out.println("Son do work");             

       }

}

##定义工厂方法

public interface IFactory{

         public IWork getWork();

}

public class FatherFactory implements  IFactory{

         public IWork getWork(){

               return new FatherWork();

        }

}

public class SonFactory implements  IFactory{

         public IWork getWork(){

               return new SonWork();

        }

}
##下面测试一下

public static void main(String[] args){

            IFactory factory1 = new FatherFactory();

            factory1.getWork().doWork();

            IFactory factory2 = new SonFactory();

            factory2.getWork().doWork();

}

##输出结果

Father do work

Son do work