Question

Exercise 8 (The interface class-like) Assume you have the Edible interface with its abstract method Design a class named Animal and its two subclasses named Mammal and Dairy. Make Sheep and Bear as subclasses of Mammal and make Chicken and Cow as subclasses of Dairy. The Sheep and Dairy classes implement the Edible interface. howToEat) and sound() are the main two methods for all edible classes while sound() is the main method for the non-edible classes. 1. Draw the UML diagram for the classes and the interface. 2. Use Arraylist class to create an array list for storing objects 3. Write a test program that creates one object of each class and store it in the ArrayList 4. For all created objects, the program should implement the interface feature to display the way to eat the object if it is edible and its sound. Also it should display the sound of the object if it is not edible. Insure that the concepts of abstract classes and interface class-like are used.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// Edible.java

public interface Edible {
   public void howToEat();

   public void sound();
}
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// Animal.java

public abstract class Animal {
public abstract void sound();
}
_____________________

// Mammal.java

public abstract class Mammal extends Animal {

}

_____________________

// Dairy.java

public abstract class Dairy extends Animal implements Edible{

}

_____________________

// Bear.java

public class Bear extends Mammal {

   @Override
   public void sound() {
       System.out.println("growl growl");

   }

}
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// Chicken.java

public class Chicken extends Dairy {

   @Override
   public void howToEat() {
       System.out.println("It eats grains.");

   }

   @Override
   public void sound() {
       System.out.println("cluck cluck");

   }

}

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// Cow.java

public class Cow extends Dairy {

   @Override
   public void howToEat() {
       System.out.println("It eats grass.");

   }

   @Override
   public void sound() {
       System.out.println("Moo Moo.");

   }

}

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// Sheep.java

public class Sheep extends Mammal implements Edible {

   @Override
   public void howToEat() {
       System.out.println("It eats grass.");

   }

   @Override
   public void sound() {
       System.out.println("Baa Baa.");

   }

}

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// Test.java

import java.util.ArrayList;

public class Test {

   public static void main(String[] args) {

       ArrayList<Animal> arl=new ArrayList<Animal>();
       arl.add(new Sheep());
       arl.add(new Bear());
       arl.add(new Chicken());
       arl.add(new Cow());
       for(int i=0;i<arl.size();i++)
       {
           if(arl.get(i) instanceof Edible)
           {
               System.out.println(arl.get(i).getClass().getSimpleName()+":");
               ((Edible)arl.get(i)).howToEat();
               arl.get(i).sound();
           }
           else
           {
               System.out.println(arl.get(i).getClass().getSimpleName()+":");
              
               arl.get(i).sound();
           }
       }
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Output:

Sheep:
It eats grass.
Baa Baa.
Bear:
growl growl
Chicken:
It eats grains.
cluck cluck
Cow:
It eats grass.
Moo Moo.

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