AtomicKotlinCourse/Object-Oriented Programming/Nested Classes/Exercise 4/task.md

Nested Classes (#4)

Improve the implementation of the State pattern in Ticket.kt. Change Seat from an enumeration to a non-nested abstract class, with a nested subclass for each Seat type. Seat contains abstract member functions for upgrade() and meal(). There's also a toString() for Seat that produces the simpleName of the specific subclass.

Ticket now becomes a simple holder for a Seat object, along with upgrade() and meal() functions which forward their actions to the Seat object.

Bonus (Challenging): Why can't you use delegation for seat in Ticket?

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