Write a class MonsterTruck that relates to the Car and Truck classes from Self-Check Problems 1 and 2 and whose methods have the following behavior. Whenever possible, use inheritance to reuse behavior from the superclasses.
Method | Output/Return |
m1 | monster 1 |
m2 | truck 1 |
| car 1 |
toString | "monster vroomvroom" |
Problem 1
MinMaxAccount. A company has written a large class BankAccount with many methods including:
public BankAccount(Startup s) | Constructs a BankAccount object using information in s |
public void debit(Debit d) | Records the given debit |
public void credit(Credit c) | Records the given credit |
public int getBalance ( ) | Returns the current balance in pennies |
Design a new class MinMaxAccount whose instances can be used in place of a bank account but include new behavior of remembering the minimum and maximum balances ever recorded for the account. The class should have a constructor that accepts a Startup parameter. The bank account’s constructor sets the initial balance on the basis of the startup information. Assume that only debits and credits change an account’s balance. Include these new methods in your class:
public int getMin ( ) | Returns the minimum balance in pennies |
public int getMax ( ) | Returns the maximum balance in pennies |
Problem 2
DiscountBill. 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, 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 any |
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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