Suppose a class GroceryBill keeps track of a list of items being purchased at a market:Method/ConstructorDescriptionconstructs a GroceryBill object for the given clerkpublic GroceryBill(Employee clerk)public void add(Item i)public double getTotal()public void printReceipt(0adds i to this bill's totalreturns the cost of these itemsprints a list of itemsGroceryBill objects interact with Item objects. An Item has the following public methods:Method/ConstructorDescriptionreturns the price for this itempublic double getDiscount() returns the discount for this itempublic double getPrice()For example, a candy bar item might cost 1.35 with a discount of 0.25 for preferred customers, meaning that preferred customersget it for 1.10. (Some items will have no discount, 0.0.) Currently the above classes do not consider discounts. Every item in a bill ischarged full price, and item discounts are ignored.Define a class DiscountBill that extends GroceryBill to compute discounts for preferred customers. The constructor forDiscountBill accepts a parameter for whether the customer should get the discount.Your class should adjust the amount reported by getTotal for preferred customers. For example, if the total would have been $80but a preferred customer is getting $20 in discounts, then getTotal should report the total as $60 for that customer. You should alsokeep track of how many items a customer is getting a non-zero discount for and the overall discount, both as a total amount and as apercentage of the original bill. Include the extra methods below that allow a client to ask about the discount:Method/ConstructorDescriptionpublic DiscountBill(Employee clerk, boolean preferred) constructs discount bill for given clerkpublic int getDiscountCount()public double getDiscountAmount ()public double getDiscountPercent ()returns the number of items that were discounted, if anyreturns the total discount for this list of items, if anyreturns the percent of the total discount as a percent of what thetotal would have been otherwiseIf the customer is not a preferred customer the DiscountBill behaves at all times as if there is a total discount of 0.0 and no itemshave been discounted.

The following four classes are created: GroceryBill Item Employee DiscountBill extends GroceryBill…

Answered: Suppose a class GroceryBill keeps track…

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Computer Science

Suppose a class GroceryBill keeps track of a list of items being purchased at a market: Mather

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Suppose a class GroceryBill keeps track of a list of items being purchased at a market:
Method/Constructor
Description
constructs a GroceryBill object for the given clerk
public GroceryBill(Employee clerk)
public void add(Item i)
public double getTotal()
public void printReceipt(0
adds i to this bill's total
returns the cost of these items
prints a list of items
GroceryBill objects interact with Item objects. An Item has the following public methods:
Method/Constructor
Description
returns the price for this item
public double getDiscount() returns the discount for this item
public double getPrice()
For example, a candy bar item might cost 1.35 with a discount of 0.25 for preferred customers, meaning that preferred customers
get it for 1.10. (Some items will have no discount, 0.0.) Currently the above classes do not consider discounts. Every item in a bill is
charged full price, and item discounts are ignored.
Define a class DiscountBill that extends GroceryBill to compute discounts for preferred customers. The constructor for
DiscountBill accepts a parameter for whether the customer should get the discount.
Your class should adjust the amount reported by getTotal for preferred customers. For example, if the total would have been $80
but a preferred customer is getting $20 in discounts, then getTotal should report the total as $60 for that customer. You should also
keep track of how many items a customer is getting a non-zero discount for and the overall discount, both as a total amount and as a
percentage of the original bill. Include the extra methods below that allow a client to ask about the discount:
Method/Constructor
Description
public DiscountBill(Employee clerk, boolean preferred) constructs discount bill for given clerk
public int getDiscountCount()
public double getDiscountAmount ()
public double getDiscountPercent ()
returns the number of items that were discounted, if any
returns the total discount for this list of items, if any
returns the percent of the total discount as a percent of what the
total would have been otherwise
If the customer is not a preferred customer the DiscountBill behaves at all times as if there is a total discount of 0.0 and no items
have been discounted.

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