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Next, you are ready to define a class, RabbitApplication,
to help you keep track of the simulated rabbit population.
There will be just one RabbitApplication instance, and, from the
definition of the RabbitApplication class, you see that the one
RabbitApplication instance contains just one instance variable:
rabbits. The rabbits instance variable determines the state
of the RabbitApplication instance.
RabbitApplication class definition
Object subclass: #RabbitApplication
instanceVariableNames: 'rabbits'
classVariableNames: ''
poolDictionaries: ''
Two RabbitApplication instance methods are to be defined. One, the
initialize method, initializes rabbit simulations; the other, the
tickTo: method, executes rabbit simulations for a specified number
of steps.