Question
Your vet’s office is using the Pet class defined in Display 4.15 and would like to include a way to calculate the dosage amount for drugs that are commonly administered for dogs and cats. Make the following modifications to the class:
Add an instance variable that indicates if the type of the pet is a dog or a cat.
Modify the constructor and the set method to include the type of pet (i.e., dog or cat).
Add a method named
that returns as a double the dosage in ml for the sedative
acepromazine.
Add a method named
that returns as a double the dosage in ml for the pain killer
carprofen.
The dosage calculation is
is in pounds.
For acepromazine, use mg per
,
and mg per
for dogs and
for cats.
For carprofen, use mg per
,
and mg per
for dogs and
for cats.
Modify the main method in Display 4.16 to include tests of the new methods.
Answer
//Pet.java
public class Pet
{
private String name;
private int age;
private double weight;
private boolean isPet;
public Pet(String startName) {
name = startName;
age = 0;
weight = 0;
isPet = true;
}
public Pet(double startWeight) {
name = "No name still";
age = 0;
if (startWeight < 0) {
System.out.println("Error: Negative weight");
System.exit(0);
} else
weight = startWeight;
isPet = true;
}
public Pet(String startName, int ageBegins, double startWeight, boolean type) {
name = startName;
if (ageBegins < 0 || startWeight < 0) {
System.out.println("Erro contains Negative age or weight");
System.exit(0);
} else {
age = ageBegins;
weight = startWeight;
}
isPet = type;
}
public void set(String newName, int newAge, double newWeight, boolean type) {
name = newName;
if (newAge < 0 || newWeight < 0) {
System.out.println("Error: Negative age or weight");
System.exit(0);
} else {
age = newAge;
weight = newWeight;
isPet = type;
}
}
public double acepromazine()
{
if (isPet)
return (weight / 2.2) * (0.03 / 10);
else
return (weight / 2.2) * (0.002 / 10);
}
public double carprofen()
{
if(isPet)
return (weight / 2.2) * (0.5 / 12);
else
return (weight / 2.2) *
(0.25 / 12);
}
}
//Modify Display 4.16 from the textbook.
import java.util.*;
public class PetDemo {
public static void main(String args[]) {
Pet p = new Pet("Daniel Plainview");
System.out.println("No records on your pet name ");
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter the pet's name:");
String name = keyboard.nextLine();
System.out.println("Enter the pet's age:");
int age = keyboard.nextInt();
System.out.println("Enter the pet's weight:");
double weight = keyboard.nextDouble();
keyboard.nextLine();
System.out.println("Is the pet a dog? (y/n):");
boolean isDog;
String choice = keyboard.nextLine();
if (choice.equalsIgnoreCase("y"))
isDog = true;
else
isDog = false;
p.set(name, age, weight, isDog);
System.out.println("Records as follows:");
System.out.println(p);
System.out.println("Acepromazine needed: " + p.acepromazine() + " ml");
System.out.println("Carprofen needed: " + p.carprofen() + " ml");
}
}
Result output:
No records on your pet name
Enter the pet's name:sweety
Enter the pet's age:5
Enter the pet's weight:12
Is the pet a dog? (y/n):y
Records as follows:
Acepromazine needed: 0.01636363636363636 ml
Carprofen needed: 0.22727272727272724 ml