Inheritance and Interfaces - Building Java Programs: A Back to Basics Approach - page 624

2. Write a set of classes that define the behavior of certain animals. They can be used in a simulation of a world with
many animals moving around in it. Different kinds of animals will move in different ways (you are defining those
differences). As the simulation runs, animals can “die” when two or more of them end up in the same location,
in which case the simulator randomly selects one animal to survive the collision. See your course web site or
www.buildingjavaprograms.com for supporting files to run such a simulation.

The following is an example set of animals and their respective behavior:

Class toString getMove

Bird B Moves randomly 1 step in one of the four directions each time

Frog F Moves randomly 3 steps in one of the four directions

Mouse M Moves west 1 step, north 1 step (zig-zag to the northwest)

Rabbit V Move north 2 steps, east 2 steps, south 2 steps (“hops” to the right)

Snake S Moves south 1 step, east 1 step, south 1 step, west 2 steps, south 1 step, east 3 steps, south

1 step, west 4 steps, ... (“slithers” left and right in increasing length)

Turtle T Moves south 5 steps, west 5 steps, north 5 steps, east 5 steps (clockwise box)

Wolf W Has custom behavior that you define

Your classes should be stored in files called Bird.java, Frog.java, Mouse.java, Rabbit.java, Snake.java, Turtle.java,
and Wolf.java.

3. Write an inheritance hierarchy that stores data about sports players. Create a common superclass and/or interface to
store information common to any player regardless of sport, such as name, number, and salary. Then create sub-
classes for players of your favorite sports, such as basketball, soccer, or tennis. Place sport-specific information and
behavior (such as kicking or vertical jump height) into subclasses whenever possible.

4. Write an inheritance hierarchy to model items at a library. Include books, magazines, journal articles, videos, and
electronic media such as CDs. Include in a superclass and/or interface common information that the library must
have for every item, such as a unique identification number and title. Place behavior and information that is specific
to items, such as a video's runtime length or a CD's musical genre, into the subclasses.