Question

This Code Is Supposed To Be Performed In JAVA

1.) Create an abstract class DiscountPolicy. It should have a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item. The method has two parameters, count and itemCost. Create a driver class that tests this class and provide the UML.

2.) In a separate program, define DiscountPolicy as an interface instead of the abstract class. Create a driver class that tests this class and provide the UML.

Perform The Following

1.) Create an abstract class DiscountPolicy with a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item.

2.) Create a driver class

3.) Create an interface class DiscountPolicy with a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item.

4.) Create a driver class or use the same driver class that you created earlier

Answer 1

Short Summary:

• Provided the source code and sample output as per the requirements.

Source Code:

1) Create an abstract class DiscountPolicy with a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item.

DiscountPolicy.java:

/**
*
* Abstract class DiscountPolicy
*
*/
public abstract class DiscountPolicy {
   // abstract method with two parameters
   public abstract double computeDiscount(int count, double itemCost);
}
DiscountPolicyDerive.java:

/**
*
* Class DiscountPolicyDerive that derives abstract class
*
*/
public class DiscountPolicyDerive extends DiscountPolicy {
   // variable to store the number of items
   private int numberOfItems;
  
   public DiscountPolicyDerive(int itemsTotal) {
       this.numberOfItems = itemsTotal;
   }
  
   // computeDiscount that calculates the discount
   @Override
   public double computeDiscount(int count, double itemCost) {
       double discount = 0;
  
       if (count > numberOfItems)
           discount = (count / numberOfItems) * itemCost;
  
       return discount;
   }
}

DiscountPolicyDemo.java:

/**
*
* Driver class DiscountPolicyDemo
*
*/
public class DiscountPolicyDemo {

   public static void main(String[] args) {
       // Creating object by passing the number of items
       DiscountPolicy discountDerive = new DiscountPolicyDerive(2);
       // calling the abstract method
       double discount = discountDerive.computeDiscount(10, 20.5);
       // displaying the discount amount
       System.out.print("Discount Amount : " +discount);
   }

}

SAMPLE OUTPUT:

UML DIAGRAM:

2.) In a separate program, define DiscountPolicy as an interface instead of the abstract class. Create a driver class that tests this class and provide the UML

DiscountPolicyInterface.java:

/**
* interface DiscountPolicy
*/
public interface DiscountPolicyInterface {
   double computeDiscount(int count, double itemCost);
}

DiscountPolicyDerive.java:

/**
*
* Class DiscountPolicyDerive that derives abstract class
*
*/
public class DiscountPolicyDerive implements DiscountPolicyInterface {
   // variable to store the number of items
   private int numberOfItems;

   public DiscountPolicyDerive(int itemsTotal) {
       this.numberOfItems = itemsTotal;
   }

   // computeDiscount that calculates the discount
   @Override
   public double computeDiscount(int count, double itemCost) {
       double discount = 0;

       if (count > numberOfItems)
           discount = (count / numberOfItems) * itemCost;

       return discount;
   }
}

DiscountPolicyDemo.java:

/**
*
* Driver class DiscountPolicyDemo
*
*/
public class DiscountPolicyDemo {

   public static void main(String[] args) {
       // Creating object by passing the number of items for the class
       DiscountPolicyDerive discountDerive = new DiscountPolicyDerive(2);
       // calling the abstract method
       double discount = discountDerive.computeDiscount(10, 20.5);
       // displaying the discount amount
       System.out.print("Discount Amount : " +discount);
   }

}

SAMPLE RUN:

UML DIAGRAM:

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