Question
Programming Project 4.10 required adding an instance variable to the Pet class defined in Display 4.15 to indicate if the pet is a dog or cat. A better organization is to define Pet as a superclass of the Dog and Cat classes. This organization eliminates the need for an instance variable to indicate the type of the pet. Do or redo Programming Project 4.10 with inheritance. The acepromazine() and carprofen() methods should be defined in the Pet class to simply return 0. Override both methods in the Dog and Cat classes to calculate the correct dosage. Write a main method with appropriate tests to exercise the changes.
Answer
PET CLASS
public class Pet {
protected String name;
protected int age;
protected double weight;
Pet(){};
Pet(String name,int age,double weight){
this.age=age;
this.weight=weight;
this.name=name;
}
public double acepromazine()
{
return 0;
}
public double carprofen()
{
return 0;
}
}
CAT CLASS
public class Cat extends Pet {
Cat(){};
Cat(String name,int age, double weight){
super(name,age,weight);
}
public double acepromazine()
{
return (weight / 2.2) * (0.03 / 10);
}
public double carprofen()
{
return (weight / 2.2) * (0.5 / 12);
}
public String toString()
{
return ("\nThe Pet Cat Named: "+name+"\nWeight:"+weight+"\nAge:"+age+"\nAcepromazine:"+acepromazine()
+"\nCarprofen:"+carprofen());
}
}
DOG CLASS
public class Dog extends Pet {
Dog(){};
Dog(String name,int age, double weight){
super(name,age,weight);
}
public double acepromazine()
{
return (weight / 2.2) * (0.002 / 10);
}
public double carprofen()
{
return (weight / 2.2) *
(0.25 / 12);
}
public String toString()
{
return ("\nThe Pet Dog Named: "+name+"\nWeight:"+weight+"\nAge:"+age+"\nAcepromazine:"+acepromazine()
+"\nCarprofen:"+carprofen());
}
}
public class TestMethod {
public static void main(String[] args) {
Cat cat1= new Cat("Tom",18,22.5);
Cat cat2= new Cat("Jazzy",21,33.5);
Dog dog1= new Dog("Hachi",8,16.4);
Dog dog2= new Dog("Jon",7,12.5);
System.out.println(cat1.toString());
System.out.println(cat2.toString());
System.out.println(dog1.toString());
System.out.println(dog2.toString());
}
}
OUTPUT
The Pet Cat Named: Tom
Weight:22.5
Age:18
Acepromazine:0.03068181818181818
Carprofen:0.4261363636363636
The Pet Cat Named: Jazzy
Weight:33.5
Age:21
Acepromazine:0.04568181818181818
Carprofen:0.6344696969696969
The Pet Dog Named: Hachi
Weight:16.4
Age:8
Acepromazine:0.0014909090909090907
Carprofen:0.15530303030303028
The Pet Dog Named: Jon
Weight:12.5
Age:7
Acepromazine:0.0011363636363636363
Carprofen:0.11837121212121211
Discussions
Nadir Ali Khan
public class Cat extends Pet {
.......
........
public double acepromazine()
{
return (weight / 2.2) * (0.002 / 10); //Correct For Cat Class
}
*************************************************************************************************************************
public class Dog extends Pet {
..........
...........
public double acepromazine()
{
return (weight / 2.2) * (0.03/ 10); //Correct For Dog Class
}
Post the discussion to improve the above solution.