The Animal is an abstract class with the following methods:
int beEaten(): returns the number of calories providedvoid gainCalories (int amount): increases number of calories.When you construct an Animal, the
constructor needs to know how many calories are in the animal.
CarnivoreAnimal is a concrete subclass of Animal. It also has a
method void eat(Animal other). This method causes the
CarnivoreAnimal to gain the calories provided by the other Animal
(found using the beEaten() method).