请使用java创建几个具有抽象方法enginePower实现的汽车品牌类，例如BMW、Audi、Honda等。 在名为Cars类中声明抽象方法。为每个汽车品牌创建对象，并打印出这些汽车的发动机功率。

以下是示例代码：

abstract class Cars {
    public abstract int enginePower();
}

class BMW extends Cars {
    public int enginePower() {
        return 300;
    }
}

class Audi extends Cars {
    public int enginePower() {
        return 280;
    }
}

class Honda extends Cars {
    public int enginePower() {
        return 200;
    }
}

public class Main {
    public static void main(String[] args) {
        Cars bmw = new BMW();
        Cars audi = new Audi();
        Cars honda = new Honda();

        System.out.println("BMW engine power: " + bmw.enginePower());
        System.out.println("Audi engine power: " + audi.enginePower());
        System.out.println("Honda engine power: " + honda.enginePower());
    }
}

输出结果：

BMW engine power: 300
Audi engine power: 280
Honda engine power: 200