Question

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.

Derive a class BulkDiscount from DiscountPolicy. It should have a constructor that has two parameters minimum and percent. It should define the method computeDiscount so that if the quantity purchased of an item is more then minimum, the discount is percent percent.

Answer 1

//DiscountPolicy.java

public abstract class DiscountPolicy {
   public abstract double computeDiscount(int count, double itemCost);
}

//BulkDiscount.java

public class BulkDiscount extends DiscountPolicy {
   int minimum;
   double percent;

   public BulkDiscount(int minimum, double percent) {
       this.minimum = minimum;
       this.percent = percent;
   }

   @Override
   public double computeDiscount(int count, double itemCost) {
       if (count > minimum) {
           double discount = itemCost * count * (percent / 100);
           return discount;
       }
       return 0;
   }

}