Java quiz. Допишите класс, реализующий интерфейс АА, который

Допишите класс, реализующий интерфейс АА, который будет возвращать сумму возвращаемых значений методами а() двух приведенных классов.


interface AA {
    int a();
}

class A implements AA {
    public int a() {
        return 1;
    }
}

class B implements AA {
    public int a() {
        return 1;
    }
}


class D implements AA {
    public int a() {
        return new A().a() + new B().a();
    }
}


class D implements AA {
     int a() {
        return new A().a() + new B().a();
    }
}


class D implements AA {
    public int a(A a, B b) {
        return а.a() + new b.a();
    }
}


class D implements AA {
    public int a() {
        return А.a() + B().a();
    }
}

Explanation

Class implementing an interface cannot narrow access modifier, so method a() has to be public.
Number of parameters cannot change with overriding, a(A a, B b) is a different method. But method a() has to be implemented for correct interface implementation.
Method a() is not static and you need an instance of an object to call it, so A.a() will not compile.

Like

Login in to like
Comment

Login in to comment
Share

Tweet

Java
Quiz

or Read more about Java Quizzes

Follow CodeGalaxy

Mobile Beta

Send Feedback

Follow CodeGalaxy

Mobile Beta

Keep exploring Java quizzes

Keep exploring
Java quizzes