Google Code-in

This task is to implement a code to demonstrate several Object oriented concepts in java. These concepts may include creating classes, encapsulation, inheritance, abstraction, polymorphism. You may write one or multiple codes to demonstrate it. Better to demonstrate in a single code. A task is said to be completed if a student is able to demonstrate 70% of the given OOPS concepts. Make a dedicated repository or show the code via a gist.

Link to your repository/gist. Please include comments in your code explaining what that part of code does.