c++ 创建型设计模式工厂方法Factory Method示例详解
作者：菜皮日记
简介
工厂方法中，每一个具体工厂类都对应创建一个具体产品类，所有具体工厂类都实现抽象工厂，所有具体产品类都实现抽象产品。
抽象工厂定义了创建抽象产品的方法签名，具体工厂类各自实现各自逻辑，来创建具体的产品。
角色
抽象工厂 Abstract Factory
定义创建产品的方法签名，即Factory Method
抽象产品 Abstract Product
定义产品的基本属性
具体工厂 Concrete Factory
实现自抽象工厂，并实现 Factory Method，实现如何创建具体产品。
具体产品 Concrete Product
实现具体产品基本属性
类图
如图所示，Dialog抽象工厂可以创建Button抽象产品，WindowsDialog和WebDialog都是具体工厂，负责创建WindownsButton和HTMLButton。
代码
abstract class Creator
{
abstract public function factoryMethod(): Product;
public function someOperation(): string
{
$product = $this->factoryMethod();
$result = "Creator: The same creator's code has just worked with " . $product->operation();
return $result;
}
}
class ConcreteCreator1 extends Creator
{
public function factoryMethod(): Product
{
return new ConcreteProduct1();
}
}
class ConcreteCreator2 extends Creator
{
public function factoryMethod(): Product
{
return new ConcreteProduct2();
}
}
interface Product
{
public function operation(): string;
}
class ConcreteProduct1 implements Product
{
public function operation(): string
{
return "{Result of the ConcreteProduct1}";
}
}
class ConcreteProduct2 implements Product
{
public function operation(): string
{
return "{Result of the ConcreteProduct2}";
}
}
function clientCode(Creator $creator)
{
echo "Client: I'm not aware of the creator's class, but it still works.\n" . $creator->someOperation() . "\n";
}
echo "App: Launched with the ConcreteCreator1.\n";
clientCode(new ConcreteCreator1());
echo "App: Launched with the ConcreteCreator2.\n";
clientCode(new ConcreteCreator2());output
App: Launched with the ConcreteCreator1.
Client: I'm not aware of the creator's class, but it still works.
Creator: The same creator's code has just worked with {Result of the ConcreteProduct1}
App: Launched with the ConcreteCreator2.
Client: I'm not aware of the creator's class, but it still works.
Creator: The same creator's code has just worked with {Result of the ConcreteProduct2}
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