③ 设计模式的艺术-03.工厂方法（Factory Method）模式

 

 

public interface Car {
    void run();
}

 

public class Audi implements Car {

    @Override
    public void run() {
        System.out.println("奥迪再跑！");
    }

}

 

public class Byd implements Car {

    @Override
    public void run() {
        System.out.println("比亚迪再跑！");
    }

}

 

public interface CarFactory {
    Car createCar();
}

 

public class AudiFactory implements CarFactory {

    @Override
    public Car createCar() {
        return new Audi();
    }

}

 

public class BydFactory implements CarFactory {

    @Override
    public Car createCar() {
        return new Byd();
    }

}

调用

?

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public class Client {     public static void main(String[] args) {         Car c1 = new AudiFactory().createCar();         Car c2 = new BydFactory().createCar();                   c1.run();         c2.run();     } }

 

新增

public class Benz implements Car {

    @Override
    public void run() {
        System.out.println("奔驰再跑！");
    }

}

 

public class BenzFactory implements CarFactory {

    @Override
    public Car createCar() {
        return new Benz();
    }

}