CS 101
LAB 11 Tuesday
Habitat Design
In this system, you store the dog type, current energy, number of feed, required daily
energy, required hunting energy amount and energy amount of a prey for each members
of dog family
The class hierarchy should be as follows:
Dog_Family
Fox
Wolf
Rufus
Note: The goal for the problem is avoid the duplicating code between three types of
dog Any duplication of code will be penalized by 20 points.
After generating the Dog_family class and its subclasses you are going to code the tester
program.
A Dog_Familty should carry the following behaviors:
DOG_FAMILY BEHAVIORS:
Dog_Family(String type, double daily_energy, double hunting_energy, double
prey_energy ) // (constructor) initializes the object and sets the required daily energy,
required hunting energy amount and energy amount of a prey . (5p)
void breed(double amount) // adds the amount of food to the energy and increments
the feed number (5p)
void hunt() // if the required amount of energy for hunting is less than or equal to the
total energy , then this method subtracts the amount from total energy, adds gathered
energy to total energy, otherwise set alive status false. (5p)
void dailyEnergy() // decreases total energy, in case of total energy is less than 0, set
alive status false (5p)
void endofLifeReport() // displays the its type and total number of feed number . Use
formatted output for the energy such as using printf (5p)
MEMBERS of DOG FAMILY:
Hint_1: The default constructor for each subclass should invoke the super class’
constructor to set the dog type to “Fox”, “Wolf”, “Rufus” or “Adistus”.
Hint_2: Use the Random class to test the probability:
Random rnd = new Random();
if (rnd.nextInt(100)>=60) // 0.4 probability case
Fox : There is 10 kcal required daily energy, 10 kcal required energy for hunting and a
prey has 50 kcal energy of this kind.. There is 0.5 probability for an attempt to hunt will
be successful. (15p).
Hint_3 : Consider overriding
Refer : Hint_2
Wolf : There is 20 kcal required daily energy, 70 kcal required energy for hunting and a
prey has 100 kcal energy of this kind.. There is 0.4 probability for an attempt to hunt will
be successful. (15p)
Refer : Hint_2, Hint_3
Rufus ; There is 20 kcal required daily energy, 70 kcal required energy for hunting and a
prey has 150 kcal energy of this kind.. There is 0.4 probability for an attempt to hunt will
be successful.. (15p)
Refer : Hint_3
Caution: The ancestor of Rufus is Wolf
TEST THE HABITAT:
-Write a test program that initializes each type of dog with initially 100 kcal energy (5p).
-Implement one month transaction (assume 30 days per month) and make an attempt for
hunting for each day. (10p)
- At the end of the month, for the dogs which has a status not alive, report the total
number of feed. (5p)
Hint_4 : Consider endofLifeReport() method
CORRECT RUN = 10 points
//
Dog_Family
public class Dog_Family {
private String type;
private double energy = 0;
private int feed_number = 0;
private double hunting_energy, daily_energy,prey_energy;
private boolean alive = true;
public Dog_Family()
{ type = "" ;
}
public Dog_Family(String type,double daily_energy,
double hunting_energy, double prey_energy){
setType(type);
setDaily_energy(daily_energy);
setHunting_energy(hunting_energy);
setPrey_energy(prey_energy);
}
public void endofLifeReport(){
System.out.println("Type " + type + " Feed number " +
feed_number);
}
public void dailyEnergy(){
if (energy>daily_energy)
energy -= daily_energy;
else{
energy = 0;
setAlive(false);
}
}
public void breed(double amount){
energy += amount;
feed_number++;
}
public void hunt(){
if (energy>=hunting_energy) {
energy -= hunting_energy;
breed(prey_energy);
}
else{
energy =0;
setAlive(false);
}
}
public double getEnergy() {
return energy;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getTransactions() {
return feed_number;
}
public boolean isAlive() {
return alive;
}
public void setAlive(boolean alive) {
this.alive = alive;
}
public int getFeed_number() {
return feed_number;
}
public void setDaily_energy(double daily_energy) {
this.daily_energy = daily_energy;
}
public void setHunting_energy(double hunting_energy) {
this.hunting_energy = hunting_energy;
}
public void setPrey_energy(double prey_energy) {
this.prey_energy = prey_energy;
}
}
//
Wolf
import java.util.Random;
public class Wolf
extends Dog_Family{
public Wolf(String type,double daily_energy,
double hunting_energy, double prey_energy){
super(type,daily_energy,hunting_energy,prey_energy);
}
public void hunt(){
Random rnd = new Random();
if (rnd.nextInt(100)>=60)
super.hunt();
}
}
//
Fox
import java.util.Random;
public class Fox extends Dog_Family{
public Fox(String type,double daily_energy,
double hunting_energy, double prey_energy){
super(type,daily_energy,hunting_energy,prey_energy);
}
public void hunt(){
Random rnd = new Random();
if (rnd.nextInt(100)>=50)
super.hunt();
}
}
//
Rufus
import java.util.Random;
public class Rufus extends Wolf{
public Rufus(String type,double daily_energy,
double hunting_energy, double prey_energy){
super(type,daily_energy,hunting_energy,prey_energy);
}
public void hunt(){
super.hunt();
}
}
// TESTER
public class Tester {
public static void main(String[] args){
Fox f = new Fox("Fox",10,10,50);
Wolf w = new Wolf("Wolf",20,70,100);
Rufus r = new Rufus("Rufus",20,70,150);
r.breed(100);
f.breed(100);
w.breed(100);
for (int i = 0; i < 30; i++) {
if (f.isAlive())
{
f.hunt();
f.dailyEnergy();
}
if (r.isAlive())
{
r.hunt();
r.dailyEnergy();
}
if (w.isAlive())
{
w.hunt();
w.dailyEnergy();
}
}
if (!f.isAlive())
{
f.endofLifeReport();
}
if (!r.isAlive())
{
r.endofLifeReport();
}
if (!w.isAlive())
{
w.endofLifeReport();
}
}
}