/** Species models a biological species, keeping track of the number
 *  of individuals.
 */
public class Species{
  // how many are there?
  private int population;

  /** getPopulation returns the number of individuals current
   *  in this Species.
   */
  public int getPopulation(){
    return population;
  }

  /** setPopulation makes this Species have population num.
   */
  public void setPopulation(int num){
    population = num;
  }
}