In our initial description of the bears and fish model, we mentioned that fish can also be considered predators—that is, they can eat plants that live in the water. If not enough plants are available, the fish will starve and die. It is relatively easy to include another class to represent the plants by “repackaging” code that is already written.
We can begin by saying that plants will not be able to move and we will not have them eat anything. So, their only action is breeding. Listing 11.13 shows the liveALittle method for the Plant class. Note that we are assuming that plants can attempt to breed after five time units.
Listing 11.13 The liveALittle method in the Plant class
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