Advantages of abstraction

Question

Hello

 

I have a question about abstraction. I just finished reading OOPS Concepts and .NET Part 2: Inheritance, Abstraction, & Polymorphism which was a really good article and very helpful start to OOP capabilities but I still don’t understand the advantages of abstraction.

 

For example, say I have a parent class called A with an abstract method getInfo(). Say the Class A has 2 child classes called B and C. Both B and C have an overridden method called GetInfo().// code in blue

 

The code in orange doesnt have abstraction, just 2 classes B and C inheiting a property form parent class A. so my question is why the code in blue better than the code in orange, in other words what is the advantages of abstraction.

 

Class A

_property1;

getInfo() //abstract method

 

Class B Class C

getInfo() //override method getInfo() //override method

 

Class A

_property1;

 

Class B Class C

 

GetB() //just another function which has the same code as ClassB.getInfo() GetC() //just another function which has the same code as ClassC.getInfo()

 

Thanks in adavance and i hope that my question makes sense