Factory Method Design Pattern工厂方法模式

package factoryMethod;

 

public interface Mobile {

   public void call();

}

public class Motorola implements Mobile {

   public void call() {    

      System.out.println("Motorola produced");

   }

}

public class Nokia implements Mobile {

   public void call() {    

      System.out.println("Nokia produced");

   }

}

public interface MobileFactory {

   public Mobile produceMobile();

}

public class MotorolaFactory implements MobileFactory {

   public Mobile produceMobile(){

      return new Motorola();

   }

}

public class NokiaFactory implements MobileFactory{

   public Mobile produceMobile(){

      return new Nokia();

   }

}

public class Client {

   public static void main(String args[]){

      MobileFactory mf = new MotorolaFactory();

      Mobile mb = mf.produceMobile();

      mb.call();

      mf = new NokiaFactory();

      mb = mf.produceMobile();

      mb.call();

   }

}

运行结果：

Motorola produced
Nokia produced

 

A factory method can be defined as a method in a class that:
(1)Selects an appropriate class from a class hierarchy based on the application context and other influencing factors
(2)Instantiates the selected class and returns it as an instance of the parent class type