Question

Using your Dog class from earlier this week, complete the following:

Create a new class called DogKennel with the following:

• Instance field(s) - array of Dogs + any others you may want

• Contructor - default (no parameters) - will make a DogKennel with no dogs in it

• Methods:

• public void addDog(Dog d) - which adds a dog to the array

• public int currentNumDogs() - returns number of dogs currently in kennel

• public double averageAge() - which returns the average age of all dogs in the kennel

• public void adoptDog(String n) - remove the dog with given name

• Create 1 more method that uses your mutator method from the dog class somehow

Create a main test - either in the DogKennel class file or in it’s own file

• Test should create a DogKennel and test each of the methods you have written

Here is the Dog Class:

public class Dog {
   // Instance FIelds
   String name, breed;
   int age;

   // Constructors
   // Default Constructor
   public Dog() {
       name = "";
       breed = "";
       age = 0;
   }

   // Parameterized Constructor
   public Dog(String n, String b, int a) {
       name = n;
       breed = b;
       age = a;
   }

   // Methods
   // Accessor Methods
   // Method to return name of Dog
   public String getName() {
       return name;
   }

   // Method to return breed of Dog
   public String getBreed() {
       return breed;
   }

   // Method to return age of Dog
   public int getAge() {
       return age;
   }

   // Mutator Method
   // Method to change breed of Dog
   public void changeBreed(String b) {
       breed = b;
   }

   // Driver method main
   public static void main(String args[]) {
       // Instantiate the class Dog
       Dog dog1 = new Dog(); // Using Default Constructor
       Dog dog2 = new Dog("Browney", "German Shepered", 5); // Using Parameterized Constructor

       // Print the current status of dogs
       System.out.println("Dog 1: ");
       System.out.println("Name: " + dog1.getName() + " Breed: " + dog1.getBreed() + " Age: " + dog1.getAge());
       System.out.println("Dog 2: ");
       System.out.println("Name: " + dog2.getName() + " Breed: " + dog2.getBreed() + " Age: " + dog2.getAge());

       // Mutate the breed of dog1
       dog1.changeBreed("Pomerian");

       // Print the changed dog
       System.out.println("Dog 1: ");
       System.out.println("Name: " + dog1.getName() + " Breed: " + dog1.getBreed() + " Age: " + dog1.getAge());
   }
}

Answer 1

Screenshot

---------------------------------------------

Program

Dog.java

public class Dog {
       // Instance FIelds
       String name, breed;
       int age;

       // Constructors
       // Default Constructor
       public Dog() {
           name = "";
           breed = "";
           age = 0;
       }

       // Parameterized Constructor
       public Dog(String n, String b, int a) {
           name = n;
           breed = b;
           age = a;
       }

       // Methods
       // Accessor Methods
       // Method to return name of Dog
       public String getName() {
           return name;
       }

       // Method to return breed of Dog
       public String getBreed() {
           return breed;
       }

       // Method to return age of Dog
       public int getAge() {
           return age;
       }

       // Mutator Method
       // Method to change breed of Dog
       public void changeBreed(String b) {
           breed = b;
       }

   }

--------------------------------------------

DogKennel.java

import java.util.ArrayList;

public class DogKennel {
   //Instance field(s) - array of Dogs + any others you may want
   private ArrayList<Dog> dog;
   private String kennelType;
   //Contructor - default (no parameters) - will make a DogKennel with no dogs in it
   public DogKennel() {
       dog=new ArrayList<Dog>();
   }
  
   //public void addDog(Dog d) - which adds a dog to the array
   public void addDog(Dog d) {
        dog.add(new Dog(d.getName(),d.getBreed(),d.getAge()));
   }
   //public int currentNumDogs() - returns number of dogs currently in kennel
  
   public int currentNumDogs() {
       return dog.size();
   }
   //public double averageAge() - which returns the average age of all dogs in the kennel
   public double averageAge() {
       double avg=0.0;
       for(int i=0;i<dog.size();i++) {
           avg+=dog.get(i).getAge();
       }
       return (avg/dog.size());
   }
   //public void adoptDog(String n) - remove the dog with given name
   public void adoptDog(String n) {
       for(int i=0;i<dog.size();i++) {
           if(dog.get(i).getName().equals(n)) {
               dog.remove(dog.get(i));
               return;
           }
       }
       System.out.println(n+" named dog is not present in the kennel!!!!");
   }
   //Method to change breed in kennel
   public void changeBreed(String n,String br) {
       for(int i=0;i<dog.size();i++) {
           if(dog.get(i).getName().equals(n)) {
               dog.get(i).changeBreed(br);
               return;
           }
       }
       System.out.println(n+" named dog is not present in the kennel!!!!");
   }
   //Mutator for set kennel type
   public void setKennelType(String type) {
       kennelType=type;
   }
   //Accessor
   public String getKennelType() {
       return kennelType;
   }
   //Method to print dogs details
   public String toString() {
       String result="";
       for(int i=0;i<dog.size();i++) {
           result+="Dog "+(i+1)+": ";
            result+="Name: " + dog.get(i).getName() + " Breed: " + dog.get(i).getBreed() + " Age: " + dog.get(i).getAge()+" ";
       }
       return result;
   }
}

--------------------------------

DogMain.java

public class DogMain {

      // Driver method main
       public static void main(String args[]) {
           //Instantiate the class DogKennel
           DogKennel dg=new DogKennel();
           // Using Parameterized Constructor create a dog
           Dog dog1 = new Dog("Browney", "German Shepered", 5);
           //add a dog into kennel
           dg.addDog(dog1);
           Dog dog2 = new Dog("Tippu", "Pomerian", 5);
           //add a dog into kennel
           dg.addDog(dog2);
         //set kennel type
           dg.setKennelType("Tall Metal 1");
           //Get kennel type
           System.out.println("Type of kennel is "+dg.getKennelType());
           // Print the current status of dog's kennel
           System.out.println("Number of dogs in the kennel = "+dg.currentNumDogs());
           //Display dog details
           System.out.print(dg.toString());
           //Average age of all dogs in the kennel
           System.out.println("Average age = "+dg.averageAge());
           //Change breed of dog2
           dg.changeBreed("Tippu","Bulldog");
         //Display dog details again for check
           System.out.print(" Display After breed change: ----------------------------- "+dg.toString());
         //Display dog details again for check
           dg.adoptDog("Browney");
           System.out.print(" Display After remove: ----------------------------- "+dg.toString());
         
       }

}

----------------------------------

Output

Type of kennel is Tall Metal 1
Number of dogs in the kennel = 2
Dog 1:
Name: Browney Breed: German Shepered Age: 5

Dog 2:
Name: Tippu Breed: Pomerian Age: 5

Average age = 5.0

Display After breed change:
-----------------------------
Dog 1:
Name: Browney Breed: German Shepered Age: 5

Dog 2:
Name: Tippu Breed: Bulldog Age: 5

Display After remove:
-----------------------------
Dog 1:
Name: Tippu Breed: Bulldog Age: 5