Unsurprisingly, the Superclass of Book is NSObject.
Method of a Superclass is not being inherited by a subclass.
Superclass/Parent class: The class from where a subclass inherits the features is called Superclass.
An object is serializable only if its class or its Superclass implements the Serializable interface.
A class derived from another class is called a subclass,
whereas the class from which a subclass is derived is called a Superclass.
And for those who are disenchanted with government, Smith recommends that they take a look at how well it's working for the mobilized and
active financial Superclass.
On the plus side, methods and managers from these base classes inherit normally, so if you absolutely
need access to these you can opt to move them into a Superclass.
Sometimes we need a Superclass to define"what to do" but, not"how to
do", it's how to do part will be implemented by the derived class according to its need,"interface" provide a solution to this.
For example, there is no way to give a function a pointer to a
Student's grade point average and transcript without also giving that function access to all of the personal data stored in the student's Person Superclass.