工厂方法模式

下面是一个工厂方法模式的示例代码

// 创建一个抽象产品类
public abstract class Animal {
    public abstract void speak();
}
// 创建具体产品类
public class Dog extends Animal {
    @Override
    public void speak() {
        System.out.println("Dog says: Woof!");
    }
}
public class Cat extends Animal {
    @Override
    public void speak() {
        System.out.println("Cat says: Meow!");
    }
}
// 创建工厂接口
public interface AnimalFactory {
    Animal createAnimal();
}
// 创建具体工厂类
public class DogFactory implements AnimalFactory {
    @Override
    public Animal createAnimal() {
        return new Dog();
    }
}
public class CatFactory implements AnimalFactory {
    @Override
    public Animal createAnimal() {
        return new Cat();
    }
}
// 客户端代码
public class Main {
    public static void main(String[] args) {
        AnimalFactory dogFactory = new DogFactory();
        Animal dog = dogFactory.createAnimal();
        dog.speak(); // 输出: Dog says: Woof!
        AnimalFactory catFactory = new CatFactory();
        Animal cat = catFactory.createAnimal();
        cat.speak(); // 输出: Cat says: Meow!
    }
}