Java Reference
In-Depth Information
381
PROGRAMMING EXERCISES
Exercise P8.1. Implement the
Coin
class described in
Section 8.2
.
Modify the
CashRegister
class so that coins can be added to the cash
register, by supplying a method
void enterPayment(int coinCount, Coin
coinType)
The caller needs to invoke this method multiple times, once for each type
of coin that is present in the payment.
Exercise P8.2. Modify the
giveChange
method of the
CashRegister
class so that it returns the number of coins of a particular type to return:
int giveChange(Coin coinType)
The caller needs to invoke this method for each coin type, in decreasing
value.
Exercise P8.3. Real cash registers can handle both bills and coins. Design a
single class that expresses the commonality of these concepts. Redesign the
CashRegister
class and provide a method for entering payments that
are described by your class. Your primary challenge is to come up with a
good name for this class.
Exercise P8.4. Enhance the
BankAccount
class by adding preconditions
for the constructor and the deposit method that require the
amount
parameter to be at least zero, and a precondition for the
withdraw
method that requires
amount
to be a value between
0
and the current
balance. Use assertions to test the preconditions.
Exercise P8.5. Write static methods
ȗ
public static double sphereVolume(double r)
ȗ
public static double sphereSurface(double r)
