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

You are confusing abstraction (the programming pattern) with the abstract keyword of the Java language. Despite the similitude, they are only very lightly related semantically.

• Abstraction means that you hide the implementation details from the code that uses a class or method. The code using your method does not need to know that you are implementing say, a List, using arrays or dynamic pointers or an embedded database or files in a filesystem.

• abstract is used to mark classes that have methods that are only declared and not implemented. It is "abstract" in the sense that they cannot be instantiated, you cannot create any instances out of these classes (but you can create them out of their concrete subclasses).