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Once you define an observer, you then connect
it to a model using the addObserver method, which the model
inherits from the Observable class. You could have your program do
the connection in the MovieApplication constructor. You should,
however, have your program do the connection in the setMovie setter
to ensure that the observer is connected to the current value of the
movie variable. You need ensured connection in Chapter 46,
where you use a choice list to change the value assigned to the movie
variable.