/**
 * Answer to question.
 *
 * # Question 4
 *
 * Q: Now that the Student class uses an animal as pet, can you still use a cat
 * object as the pet of a student? Why or why not?
 *
 * A: Yes, you can. The Student class has a method getPet() that returns the pet
 * which is Animal type.
 *
 * Q: Can you now use a dog object as the pet of a student? Why or why not?
 *
 * A: Yes, you can. But only attributes and methods definded in the Animal class
 * can be accessed. When you do so, the Dog object will be converted to an
 * Animal object. Assign a child object to a parent object is called upcasting
 * in Java. Upcasting is implicit.
 *
 * # Question 5
 *
 * Q: Where are the name and weight of the bird stored? How?
 *
 * A: The Bird class has a private instance variable name and weight which are
 * inherited from the Animal class.
 *
 * Q: Suppose a student has a bird as a pet. Can the student get the altitude of
 * his pet?
 *
 * A: No. The student's pet is an Animal object. The Bird object is a subclass
 * of Animal. getAltitude is only avaliable in Animal object. When we assign a
 * Bird to an Animal variable, upcasting happend and only attributes and methods
 * in the super class can be accessed.
 *
 */
public class Start {
	public static void main(String[] args) {
		Cat.testCat();
		Dog.testDog();
		Student.testStudent();
		Animal.testAnimal();
		Bird.testBird();
		Chicken.testChicken();
		LivingThing.testLiving();
	}
}