简单工厂设计模式

Car.java

package com.company.simplefactory;

public interface Car {
    void run();
}

FordCar.java

package com.company.simplefactory;

public class FordCar implements Car {
    @Override
    public void run() {
        System.out.println("ford run()");
    }
}

HondaCar.java

package com.company.simplefactory;

public class HondaCar implements Car {
    @Override
    public void run() {
        System.out.println("honda run()");
    }
}

config.properties

Car=com.company.simplefactory.HondaCar

CarFactory.java

package com.company.simplefactory;

import java.io.IOException;
import java.util.Properties;

public class CarFactory {
    private static Properties config = new Properties();
    static {
        try {
            config.load(CarFactory.class.getResourceAsStream("config.properties"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    static Car make() throws ClassNotFoundException, IllegalAccessException, InstantiationException {
        String carName = config.getProperty("Car");
        Class<Car> clazz = (Class<Car>) Class.forName(carName);
        Car car = clazz.newInstance();

        return car;
    }
}

Main.java

package com.company.simplefactory;

public class Main {
    public static void main(String[] args) throws IllegalAccessException, InstantiationException, ClassNotFoundException {
        Car car = CarFactory.make();
        car.run();
    }

}