Define a method called getDensity that could be added to the definition of the class SpeciesSecondTry in Listing 5.6. This method has one parameter of type double that is named area. The parameter area gives the area occupied by the species, expressed in square miles. The method getDensity returns a value of type double that is equal to the number of individuals per square mile of the species. You can assume that the area is always greater than zero. (Hint: The definition is very short.)
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