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();

?? }

}

運(yùn)行結(jié)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

Factory Method Design Pattern工廠方法模式