工厂方法模式

简单工厂模式违反了开闭原则还有单一职责原则，工厂方法模式是对简单工厂模式的进一步抽象。

工厂方法模式的优缺点

优点：

1. 用户创建实例时不需要知道知道具体类，而只需要知道工厂类；

2. 新建一个产品，只需要新建一个相应的类；

缺点：

1. 类的个数将会越来越多；

2. 增加系统抽象度，更加难以理解；

3. 抽象产品只能生产一种产品。

具体代码

AbstractFactory.php

<?php

namespace App\Creational\Factory;

abstract class AbstractFactory

{

    abstract static public function make();

}

IphoneFactory.php

<?php

namespace App\Creational\Factory;

class IphoneFactory extends AbstractFactory

{

    static public function make(){

        return new Iphone();

    }

}

XiaomiFactory.php

<?php

namespace App\Creational\Factory;

class XiaomiFactory extends AbstractFactory

{

    static public function make(){

        return new Xiaomi();

    }

}

AbstractPhone

<?php

namespace App\Creational\Factory;

abstract class AbstractPhone

{

    abstract public function playMusic();

    abstract public function playVideo();

}

Xiaomi.php

<?php

namespace App\Creational\Factory;

class Xiaomi extends AbstractPhone

{

    public function playVideo()

    {

        // TODO: Implement playVideo() method.

    }

    public function playMusic()

    {

        // TODO: Implement playMusic() method.

    }

}

Iphone.php

<?php

namespace App\Creational\Factory;

class Iphone extends AbstractPhone

{

    public function playVideo()

    {

        // TODO: Implement playVideo() method.

    }

    public function playMusic()

    {

        // TODO: Implement playMusic() method.

    }

}

测试代码

<?php

class FactoryTest extends \PHPUnit\Framework\TestCase

{

    public function testPhoneProcut()

    {

        $phone = \App\Creational\Factory\IphoneFactory::make();

        $this->assertInstanceOf(\App\Creational\Factory\Iphone::class, $phone);

    }

}

本作品采用《CC 协议》，转载必须注明作者和本文链接