大话设计模式——7.抽象工厂模式（Abstract Factory Pattern）

1.介绍

抽象工厂模式是工厂模式的进一步优化，提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。属于创建型模式。
UML图：
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2.示例

车辆制造工厂，不仅可以制造轿车也可以用来生产自行车。
1）AbstractFactory：VehicleFactory

public interface VehicleFactory {/*** 建造自行车** @return*/Bike createBike();/*** 建造轿车** @return*/Car createCar();
}

2）AbstractProductA：Bike

public interface Bike {void bikeName();
}

3）AbstractProductB：Car

public interface Car {void carName();
}

4）ConcreteFactoryA：BMWVehicleFactory

public class BMWVehicleFactory implements VehicleFactory {@Overridepublic Bike createBike() {return new BMWBike();}@Overridepublic Car createCar() {return new BMWCar();}
}

5）ConcreteFactoryB：TeslaVehicleFactory

public class TeslaVehicleFactory implements VehicleFactory {@Overridepublic Bike createBike() {return new TeslaBike();}@Overridepublic Car createCar() {return new TeslaCar();}
}

6）ConcreteProductA1：BMWCar

public class BMWCar implements Car{@Overridepublic void carName() {System.out.println("宝马 x5 四驱 燃油车");}
}

7）ConcreteProductA2：TeslaCar

public class TeslaCar implements Car {@Overridepublic void carName() {System.out.println("特斯拉 modelY 四驱 电动车");}
}

8）ConcreteProductB1：BMWBike

public class BMWBike implements Bike{@Overridepublic void bikeName() {System.out.println("宝马 碳纤维 大喇叭 二驱 自行车");}
}

9）ConcreteProductB2：TeslaCar

public class TeslaCar implements Car {@Overridepublic void carName() {System.out.println("特斯拉 modelY 四驱 电动车");}
}

10）运行：
结合建议工厂模式：工厂生产者，可以再进行优化，通过反射的机制动态构建

public class VehicleFactoryProducer {/*** 超级工厂** @param vehicleName* @return*/public static VehicleFactory creatVehicleFactory(String vehicleName) {if ("BMW".equals(vehicleName)) {return new BMWVehicleFactory();} else if ("Tesla".equals(vehicleName)) {return new TeslaVehicleFactory();}return null;}
}

运行类

public class Main {public static void main(String[] args) {System.out.println("------BMW制造工厂-----");VehicleFactory bmwFactory = VehicleFactoryProducer.creatVehicleFactory("BMW");bmwFactory.createBike().bikeName();bmwFactory.createCar().carName();System.out.println("\n------Tesla制造工厂-----");VehicleFactory teslaFactory = VehicleFactoryProducer.creatVehicleFactory("Tesla");teslaFactory.createCar().carName();teslaFactory.createBike().bikeName();}
}