《设计模式》3.工厂模式（创建型）

相比于静态工厂模式，工厂模式进一步的解耦，为每个类型创建一个工厂类，所有的工厂类都实现同一个工厂接口，通过不同的工厂类创建不同的实例。

public interface VehicleFactory {
    Vehicle create();
}

public class CarFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        return new Car();
    }
}

public class BusFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        return new Bus();
    }
}

public class TaxiFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        return new Taxi();
    }
}

public class VehicleCreator {
    public static void main(String args[]) {
        VehicleFactory carFactory = new CarFactory();
        Vehicle car = carFactory.create();
        car.specification();

        VehicleFactory busFactory = new BusFactory();
        Vehicle bus = busFactory.create();
        bus.specification();

        VehicleFactory taxiFactory = new TaxiFactory();
        Vehicle taxi = taxiFactory.create();
        taxi.specification();
    }
}

This is a Car.
This is a Bus.
This is a Taxi.