工厂模式

public class FactoryTest {
    public static void main(String[] args) {
        Car a = new AudiFactory().getCar();
        Car b = new BydFactory().getCar();
        a.run();
        b.run();
    }
}

interface Car {
    public void run();
}

class Audi implements Car {

    @Override
    public void run() {
        System.out.println("奥迪在跑");
    }
}

class Byd implements Car {

    @Override
    public void run() {
        System.out.println("比亚迪在跑");
    }
}

//工厂接口
interface CarFactory {
    Car getCar();
}

//两个工厂类
class AudiFactory implements CarFactory {
    @Override
    public Audi getCar() {
        return new Audi();
    }
}

class BydFactory implements CarFactory {
    @Override
    public Byd getCar() {
        return new Byd();
    }
}