JAVA - Abstraction

Question

I am little confused about abstraction in java.

I have checked many pages stating that abstraction is data hiding(Hiding the implementation).

What I understa

Answer 1

Data hiding is when you cannot understand how to work API internally (for example, ArrayList) without reading the documentation. API creators don't provide any access to the array that underlies there.

You hide API implementation from users that will be used it. They shouldn't worry about how it works internally, they are only interested in the functionality which is provided to them.

There is a good article about that.