tutorial_37.java

import java.util.Random;

/**
 * Driver class
 */
class PetStore {

 public static void main(String[] args) {
 
 Dog lab = new Dog("Brown", 3, true);
 Dog pit = new Dog("Black", 2.5, false);
 Dog dane = new Dog("White", 4.2, true);

 lab.setName("Barker");
 pit.setName("Whiskey");
 dane.setName("Spider");

 Dog labPit = lab.breed(pit);

 // All return the same value because the variable is a part of the class, not the instances.
 /*
 // This only works if numberOfDogs is public and static
 System.out.println( Dog.numberOfDogs );
 
 // These only work if numberOfDogs is public, and only return the same value if it is static as well 
 System.out.println( lab.numberOfDogs );
 System.out.println( pit.numberOfDogs );
 System.out.println( dane.numberOfDogs );
 System.out.println( labPit.numberOfDogs );
 
 // This doesn't work because we are trying to call this non-static method in a static way.
 // Changing getNumberOfDogs() to static method would allow this to work.
 System.out.println( Dog.getNumberOfDogs() );
 */

 System.out.println( lab.getNumberOfDogs() );
 System.out.println( pit.getNumberOfDogs() );
 System.out.println( dane.getNumberOfDogs() );
 System.out.println( labPit.getNumberOfDogs() );

 }
 
}
/**
 * Dog class
 */
class Dog { 
 private static int numberOfDogs;
 private String name, color; 
 private int age, health;
 private double height, maxHeight;
 private boolean male;
 // 
 // constructors
 //
 public Dog() {
 name = "";
 color = "";
 age = 0;
 health = 100;
 height = 0.5;
 maxHeight = 2;
 male = true;
 numberOfDogs++;
 }
 //
 public Dog(String c, double mH, boolean g) {
 name = "";
 color = c;
 age = 0; 
 health = 100;
 height = 0.5;
 maxHeight = mH;
 male = g;
 numberOfDogs++;
 }
 //
 // setters
 //
 public void setName(String n) {
 name = n;
 }
 //
 public void setColor(String c) {
 color = c;
 }
 //
 public void setGender(boolean g) {
 male = g;
 }
 //
 public void setMaxHeight(double mH) {
 maxHeight = mH;
 }
 //
 public void setHealth(int h) {
 health = h;
 }
 //
 // getters
 //
 public String getName() {
 return name;
 }
 //
 public String getColor() {
 return color;
 }
 //
 public double getHeight() {
 return height;
 }
 //
 public double getMaxHeight() {
 return maxHeight;
 }
 //
 public int getAge() { 
 return age;
 }
 //
 public boolean getGender() {
 return male;
 }
 // 
 public int getHealth() {
 return health;
 }
 //
 public int getNumberOfDogs() {
 return numberOfDogs;
 }
 // 
 // methods
 //
 public void birthday() {
 if (isDead()) {
 return;
 } 
 age++;
 
 if (height < maxHeight) {
 height += 0.8;
 }
 if (age >= 15) {
 health -= rndRange(15,20);
 }
 if (health < 0) {
 health = 0;
 }
 }
 //
 public boolean isDead() {
 return (health == 0); 
 }
 //
 public void attacks(Dog d) {
 d.setHealth(d.getHealth() - rndRange(1,10));
 }
 //
 public String toString() {
 return String.format(
 "Name: %s, Color: %s, Age: %d, Health: %d, Height: %.2f, Max-Height: %.2f, Gender: %s \n"
 ,name, color, age, health, height, maxHeight, (male ? "Male" : "Female")
 );
 }
 //
 public Dog breed(Dog d) {
 if (this.male ^ d.getGender()) {
 Dog pup = new Dog();
 // set color of pup
 switch(rndRange(1,3)) {
 case 1:
 pup.setColor(this.color);
 break;
 case 2:
 pup.setColor(d.getColor());
 break;
 case 3:
 pup.setColor(this.color + " & " + d.getColor());
 break;
 }
 // set height of pup
 double avg = (this.maxHeight + d.getMaxHeight()) / 2;
 pup.setMaxHeight(avg);
 // set gender of pup
 switch(rndRange(0,1)) {
 case 0:
 pup.setGender(false);
 break;
 case 1:
 pup.setGender(true);
 break;
 }
 // return the new created pup
 return pup;
 } 
 else {
 // genders weren't compatible
 return null;
 }
 }
 //
 // tools
 //
 private int rndRange(int start, int finish) {
 return (
 new Random().nextInt(finish + 1 - start) + start
 );
 }
 //
}