Coding Exercises: Inheritance and Interfaces
Vehicle
Suppose you are given a Vehicle interface:
public interface Vehicle
{
public String name();
public int wheelCount();
public boolean isHumanPowered();
}Write the following concrete classes implementing the Vehicle interface: Car, Motorcycle, Bicycle, Unicycle
Write a VehicleTest class to show that your classes are behaving properly. A simple test is sufficient: create an ArrayList of various Vehicle objects and iterate through it, printing info about each object.
Write a VehicleStats class that calculates various things about a list of Vehicle objects. Include these functions:
a function that takes an ArrayList of Vehicle objects and computes the total number of wheels
a function that takes an ArrayList of Vehicle objects as input, and returns an ArrayList of Vehicle objects representing those vehicles that are human-powered.
Write tests for your VehicleStats functions to demonstrate that they are returning the expected things.
Animal
Write a class Animal. You should include:
private member variables for the name (String), leg count (int), furriness (boolean)
a constructor that sets these member variables
public accessor functions for the member variables
Write four subclasses of Animal (for example: Human, Cat, Sponge, Centipede). Note that your subclass constructors will need to call the Animal constructor using super().
Write some test code to show your subclasses all behave properly.
Write a class AnimalCalculator that calculates various things about a list of Animal objects. Include these functions:
a function that takes an ArrayList of Animal objects as input, and prints the name, number of legs, and “furry” or “not furry” (returns nothing)
a function that takes an ArrayList of Animal objects as input, and returns the average number of legs
a function that takes an ArrayList of Animal objects as input, and returns the Animal object with the fewest legs
Write unit tests for all AnimalCalculator functions that return a value, to demonstrate that the functions are working correctly. These tests can be written in the AnimalCalculator class, or in an external AnimalCalculatorTest class.