Question

我在工厂模式上做R＆amp; D我已经开发了以下代码，请根据工厂模式的功能告知它是否正确..

    public abstract class Animal {
    public abstract String makeSound();
}

public class Dog extends Animal {

    @Override
    public String makeSound() {
        return "Woof";
    }

}

public class Cat extends Animal {

    @Override
    public String makeSound() {
        return "Meow";
    }

}

public class AnimalFactory {

    public Animal getAnimal(String type) {
        if ("canine".equals(type)) {
            return new Dog();
        } else {
            return new Cat();
        }
    }

}

public class Main {

    public static void main(String[] args) {
        AnimalFactory animalFactory = new AnimalFactory();

        Animal a1 = animalFactory.getAnimal("feline");
        System.out.println("a1 sound: " + a1.makeSound());

        Animal a2 = animalFactory.getAnimal("canine");
        System.out.println("a2 sound: " + a2.makeSound());
    }

}

请根据工厂模式的设计告知它是否正确，我可以进一步改进吗

Answer 1

如果传入类名，则可以避免类型检查：

public class AnimalFactory {

    public Animal getAnimal(String className) throws Exception {
        Class animalClass = Class.forName(className);              
        return animalClass.newInstance();
    }

}

关于工厂设计模式

1 个答案: