What is the difference between Abstrace Class and Interface

public abstract class A {

public void add(int a, int b);
}

//interface

public interface B{
public void add(int a, int b);
}

My question is java provides abstract class as well as interface, then what is the main difference b/w these two.
It's MNC interview question.

I gave him answers like elimination duplicate code, access restriction but still he was expecting something else.

please provide me an answer.

Thanks in advance.

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The question "what is the difference between an abstract class and an interface" is asked regularly here. We have a FAQ page about it: Interface vs Abstract Class