java programme

timer Asked: Jan 20th, 2016

Question description

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

public GroceryBill(Employee clerk)  Constructs a grocery bill object for the given clerk 
public void add(Item i)  Adds the given item to this bill 
public double getTotal()  Returns the total cost of these items 
public void printReceipt()  Prints a list of items 

Grocery bills interact with Item objects, each of which has the public methods that follow. 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 
preceding classes do not consider discounts. Every item in a bill is charged full price, and item 
discounts are ignored. 

public double getPrice()  Returns the price for this item 
public double getDiscount()  Returns the discount for this item 

Define a class DiscountBill that extends GroceryBill to compute discounts for preferred 
customers. Its constructor accepts a parameter for whether the customer should get the discount. 
Your class should also adjust the total reported for preferred customers. For example, if the total 
would have been $80 but a preferred customer is getting  $20 in discounts, and then getTotal 
should report the total as $60 for that customer. Also keep track of the number of items on which 
a customer is getting a nonzero discount and the sum of these discounts, both as a total amount 
and  as a percentage of the original bill. Include the extra methods that follow, which allow a 
client to ask about the discount. Return 0.0 if the customer is not a preferred customer or if no
items were discounted. 

public DiscountBill(Employee clerk, 
boolean preferred) 
Constructs bill for given clerk 
public int getDiscountCount()  Returns the number of items that were discounted, if 
public double getDiscountAmount()  Returns the total discount for this list of items, if any 
public double getDiscountPercent()  Returns the percent of the total discount as a percent of 
what the total would have been otherwise 

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