工厂模式

类的实例化过程交给工厂来完成，而不是直接实例化对象。这种方法提高了代码的灵活性和可维护性，使得系统更容易扩展和管理。

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

public class Dog extends Animal {
    @Override
    public String makeSound() {
        return "Bark";
    }
}

public class Cat extends Animal {
    @Override
    public String makeSound() {
        return "Meow";
    }
}

public class AnimalFactory {
    public Animal createAnimal(String type) {
        if ("Dog".equalsIgnoreCase(type)) {
            return new Dog();
        } else if ("Cat".equalsIgnoreCase(type)) {
            return new Cat();
        }
        throw new IllegalArgumentException("Invalid animal type");
    }
}

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

        Animal animal1 = animalFactory.createAnimal("Dog");
        System.out.println("Animal 1: " + animal1.makeSound());

        Animal animal2 = animalFactory.createAnimal("Cat");
        System.out.println("Animal 2: " + animal2.makeSound());
    }
}

实现

您可以在以下链接中找到完整的实现代码：

https://github.com/sumingcheng/Java-Learning/tree/main/src/com/DesignPattern/factory

实现​

实现