Question

Inheritance and Polymorphism (use Pet.java)

1. You are given a class named Pet.java.   Create two child classes named Cat.java and Dog.java. Cat.java should add attributes for color and breed. Dog.java should add attributes for breed and size (use String for small, medium, large). Add appropriate constructors, getter/setter methods and toString() methods.   In a separate file named PetDriver.java, create a main. In the main, create an ArrayList of Pet. Add an instance of Cat and an instance of Dog to the ArrayList. You don’t have to get attributes from user, you can make up information. Then, print the contents of the ArrayList in a readable fashion. Turn in Cat.java and Dog.java.

/**
* Parent class for inheritance question in sample final.
*

*
*/
public class Pet
{
   private String name;
   private int age;
   private String type;

   /**
   * @param name
   * @param age
   * @param type
   */
   public Pet(String name, int age, String type)
   {
       super();
       this.name = name;
       this.age = age;
       this.type = type;
   }

   /**
   * @return the name
   */
   public String getName()
   {
       return name;
   }

   /**
   * @param name
   * the name to set
   */
   public void setName(String name)
   {
       this.name = name;
   }

   /**
   * @return the age
   */
   public int getAge()
   {
       return age;
   }

   /**
   * @param age
   * the age to set
   */
   public void setAge(int age)
   {
       this.age = age;
   }

   /**
   * @return the type
   */
   public String getType()
   {
       return type;
   }

   /**
   * @param type
   * the type to set
   */
   public void setType(String type)
   {
       this.type = type;
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString()
   {
       return "Pet [name=" + name + ", age=" + age + ", type=" + type + "]";
   }

}

Answer 1

// do comment if any problem arises

// code

Pet.java:

public class Pet

{

   private String name;

   private int age;

   private String type;

   /**

   * @param name

   * @param age

   * @param type

   */

   public Pet(String name, int age, String type)

   {

       super();

       this.name = name;

       this.age = age;

       this.type = type;

   }

   /**

   * @return the name

   */

   public String getName()

   {

       return name;

   }

   /**

   * @param name

   * the name to set

   */

   public void setName(String name)

   {

       this.name = name;

   }

   /**

   * @return the age

   */

   public int getAge()

   {

       return age;

   }

   /**

   * @param age

   * the age to set

   */

   public void setAge(int age)

   {

       this.age = age;

   }

   /**

   * @return the type

   */

   public String getType()

   {

       return type;

   }

   /**

   * @param type

   * the type to set

   */

   public void setType(String type)

   {

       this.type = type;

   }

   /*

   * (non-Javadoc)

   *

   * @see java.lang.Object#toString()

   */

   @Override

   public String toString()

   {

       return "Pet [name=" + name + ", age=" + age + ", type=" + type + "]";

   }

}

Cat.java:

public class Cat extends Pet {

    private String color;

    private String breed;

    // constructor for Cat

    public Cat(String name, int age, String color, String breed) {

        super(name, age, "Cat");

        this.color = color;

        this.breed = breed;

    }

    // getters and setters

    public String getColor() {

        return color;

    }

    public String getBreed() {

        return breed;

    }

    public void setColor(String color) {

        this.color = color;

    }

    public void setBreed(String breed) {

        this.breed = breed;

    }

    // tostring method

    @Override

    public String toString() {

        return "Cat [name=" + super.getName() + ", age=" + super.getAge() + ", color=" + color + ", breed=" + breed

                + "]";

    }

}

Dog.java:

public class Dog extends Pet {

    private String breed;

    private String size;

    // constructor for Dog

    public Dog(String name, int age, String size, String breed) {

        super(name, age, "Dog");

        this.breed = breed;

        this.size = size;

    }

// getters and setters

    public String getBreed() {

        return breed;

    }

    public String getSize() {

        return size;

    }

    public void setBreed(String breed) {

        this.breed = breed;

    }

    public void setSize(String size) {

        this.size = size;

    }

    // tostring method

    @Override

    public String toString() {

        return "Dog [name=" + super.getName() + ", age=" + super.getAge() + ", breed=" + breed + ", size=" + size + "]";

    }

}

PetDriver.java:

import java.util.ArrayList;

public class PetDriver {

    public static void main(String[] args) {

        ArrayList<Pet> pets = new ArrayList<>();

        pets.add(new Dog("Billu", 5, "small", "Bull Dog"));

        pets.add(new Cat("Billu", 10, "Brown", "Persian Cat"));

        for (int i = 0; i < pets.size(); i++) {

            System.out.println(pets.get(i));

        }

    }

}

Output: