Polymorphism: Why is it needed especially from an OOP standpoint? What is the essential concept when you cast objects regarding Polymorphism/Inheritance? (Related Chapters 11,12,13, 19) Generics:...

Polymorphism: Why is it needed especially from an OOP standpoint? What is the essential concept when you cast objects regarding Polymorphism/Inheritance? (Related Chapters 11,12,13, 19)

Generics: Explain Generic Programming. Why is generics important as a data type regarding objects?

Polymorphism and Objects: Explain an array of polymorphic objects in a single/double dimensional array. How do you access this? How do you process this? When would you use this?    Also, when the new topic/chapter is posted regarding File/IO: Write a few lines of code that allow you to save/retrieve this data from a file using the appropriate class/methods. Do this in two ways: StreamFile I/O and URL access. You can also illustrate this in your code via text (.txt) and binary (.dat) data access.  Also, write a few more additional lines of code illustrating StreamFile  I/O access for .txt and .bin files.