11. Animal

The Animal is an abstract class with the following methods:

• int beEaten(): returns the number of calories provided
• void 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).