public interface Car {
    String getName();
}

public class Audi implements Car {
    @Override
    public String getName() {
        return "audi";
    }
}

public class Benz implements Car {
    @Override
    public String getName() {
        return "Benz";
    }
}

public class Bmw implements Car {
    @Override
    public String getName() {
        return "Bmw";
    }
}