public interface ICar {

    public void run();

}

public interface IDriver {

    public void drive();

}

public class Benz implements ICar {

        public void run() {

        System.out.println("奔驰车在跑");

    }

}

 

public class BMW implements ICar{

        public void run() {

        System.out.println("宝马车在跑！");

    }

}

 

public class Driver implements IDriver{

    private ICar mIcar;

    public Driver(ICar car) {

        mIcar = car;

    }

    public void drive() {

        mIcar.run();

    }

}