please help with all of these in short answer, i will upvote

a) State the main differences between the following widget types: container widgets, basic controls, and abstract model widgets.

b) Write a JavaFX code fragment to create the elements of an MVC-based system and connect them together using the publish-subscribe pattern. Assume that the following classes exist: BoxModel, BoxController, LargeBoxView, SmallBoxView, BoxInteractionModel. Assume that your code will be part of a JavaFX application class (but you do not need to write the rest of the class, just the code specified above).