timer Asked: May 13th, 2013

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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