Lecture 16 - MVC

Question 1

Design Patterns

Answer 1

Standard Solutions which are “good” in many situations but we will need to tailor them to specific situations.

Question 2

MVC

Answer 2

Typically used to construct GUI. Allows us to decouple Model and View. Model is data and operations on data. View is what we see in the User Interface. A controller is used to change the model.

Question 3

Observer and Observable

Answer 3

Observer - Object that wants to updated when the state of an object changes.
Observable - An object of which the state can be interesting to another object.

Question 4

Methods in Observable

Answer 4

setChanged - Indicates that this object has changed.
hasChanged - Tests if this object has changed.
clearChanged - Indicates that the object has no longer changed or that it has notified all its observers. Automatically called by notifyObservers.
notifyObservers - Notifies all its observers that the object has changed.