OO Programming in Java
Additional Material
Vending Machine View Helper Classes
The SCView classes included in the Exercise 3a Review (Zoo with a View)
problem are sufficient to complete the Vending Machine GUI homework. For those of you who wish to explore or make
it a little fancier I have included the TwoStateCanvas class and the ObserverLabel class.
The TwoStateCanvas starts its own thread and flashes an image.
The ObserverLabel is an Observer and displays the string passed to it from notifyAll(String)