【Design Pattern】Factory

1.產品接口，產品實現類和簡單工廠一樣

package Factory;

public interface Animal {

	public void makeSound();

}

package Factory;

public class Dog implements Animal{

	@Override
	public void makeSound() {
		System.out.println("wang");	
	}
}

package Factory;

public class Cat implements Animal{

	@Override
	public void makeSound() {
		System.out.println("miao");	
	}
}

2.工廠接口類

package Factory;

public interface AnimalFactory {

	public Animal createAnimal();
}

3.工廠實現類

package Factory;

public class DogFactory implements AnimalFactory{

	@Override
	public Animal createAnimal() {
		return new Dog();
	}
}

package Factory;

public class CatFactory implements AnimalFactory{

	@Override
	public Animal createAnimal() {
		return new Cat();
	}

}

4.demo

package Factory;

public class AnimalFactoryDemo {

	public static void main(String[] args){
		AnimalFactory dogfactory = new DogFactory();
		dogfactory.createAnimal().makeSound();
		AnimalFactory catfactory = new CatFactory();
		catfactory.createAnimal().makeSound();
	}
}