Inheritance and method overriding

Question

Can anybody please explain this question with the output.
https://www.sololearn.com/post/180153/?ref=app

Answer 1

Avinesh review this code you will get to know what is happening
https://code.sololearn.com/cc35W1B8fs3s/?ref=app

Answer 2

Avinesh yeah somehow the right wording can be Is-A relationship between the classed so whenever we invoked overriding function that is worked like run time polymorphic function and return that value which class object is invoked and overriden this override leads to the code snippet gives output like this way
IS-A relationship is mentaining in the child parent and grandparent class at run time when overriden function are invoked
this link will give you some more information about this
https://www.javatpoint.com/method-overriding-in-java

Answer 3

Sami Khan Kindly check the post.
I am aware of what you mentioned, but still thanks for that explanation.

Answer 4

GAWEN STEASY so only the reference changes but the instance remain of the same type.
And overridden methods are invoked based on the instance and not of the reference. Did I say it right?

Answer 5

Try to add some more methods like in DerivedB class.. say demob(){
sopln("demob");
}
Now if you try to call this method using b1 reference variable.. you will get an error, because the reference is type of base.. and it bounds to call only base type methods.

Answer 6

Inheritance allows to inherit the properties from base class to child class..
Method overriding is a type of runtime polymorphism, which depends on inheritance.. to override a method there must be inheritance..
And in method overriding we create reference type of parent class but it refers to the object of child class..
Ex:
Parent obj = new Child();
This achieves runtime polymorphism..
But in inheritance:
We create reference and object both of child class.. which takes the property of the parent class and we can call parent method as well..
Child obj = new Child();

Answer 7

Oh sorry.. let me see..

Answer 8

Sami Khan Thank you.
GAWEN STEASY I really appreciate the effort you put in to help me understand this. Thanks a lot.