简介
拿工厂方法模式作对比，在工厂方法模式中，一个工厂只能创建一种产品，如椅子工厂只能创建椅子。而抽象工厂可以创建一系列产品，如家具工厂可以创建椅子，桌子，床等等。
抽象工厂类负责定义可以创建的抽象产品类，具体工厂编写不同风格（即各自的业务逻辑）的创建产品的过程。
角色
类图
图中展示，GUIFactory 抽象工厂定义可以创建 Button 和 Checkbox 抽象产品。
具体工厂 WinFactory 可以创建出 Win 风格的 WinButton 和 WinCheckbox，MacFatory 可以创建出 Mac 风格的 MacButton 和 MacCheckbox。
类图
代码
interface AbstractFactory{ public function createProductA(): AbstractProductA;
public function createProductB(): AbstractProductB;}
class ConcreteFactory1 implements AbstractFactory{ public function createProductA(): AbstractProductA { return new ConcreteProductA1(); }
public function createProductB(): AbstractProductB { return new ConcreteProductB1(); }}
class ConcreteFactory2 implements AbstractFactory{ public function createProductA(): AbstractProductA { return new ConcreteProductA2(); }
public function createProductB(): AbstractProductB { return new ConcreteProductB2(); }}
interface AbstractProductA{ public function usefulFunctionA(): string;}
class ConcreteProductA1 implements AbstractProductA{ public function usefulFunctionA(): string { return "The result of the product A1."; }}
class ConcreteProductA2 implements AbstractProductA{ public function usefulFunctionA(): string { return "The result of the product A2."; }}
interface AbstractProductB{ public function usefulFunctionB(): string;
public function anotherUsefulFunctionB(AbstractProductA $collaborator): string;}
class ConcreteProductB1 implements AbstractProductB{ public function usefulFunctionB(): string { return "The result of the product B1."; }
public function anotherUsefulFunctionB(AbstractProductA $collaborator): string { $result = $collaborator->usefulFunctionA();
return "The result of the B1 collaborating with the ({$result})"; }}
class ConcreteProductB2 implements AbstractProductB{ public function usefulFunctionB(): string { return "The result of the product B2."; }
public function anotherUsefulFunctionB(AbstractProductA $collaborator): string { $result = $collaborator->usefulFunctionA();
return "The result of the B2 collaborating with the ({$result})"; }}
function clientCode(AbstractFactory $factory){ $productA = $factory->createProductA(); $productB = $factory->createProductB();
echo $productB->usefulFunctionB() . "\n"; echo $productB->anotherUsefulFunctionB($productA) . "\n";}
echo "Client: Testing client code with the first factory type:\n";clientCode(new ConcreteFactory1());
echo "Client: Testing the same client code with the second factory type:\n";clientCode(new ConcreteFactory2());
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output:
Client: Testing client code with the first factory type:The result of the product B1.The result of the B1 collaborating with the (The result of the product A1.)Client: Testing the same client code with the second factory type:The result of the product B2.The result of the B2 collaborating with the (The result of the product A2.)
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