USER-DEFINED CLASSES AND ADTS - Java Programming: From Problem Analysis to Program Design - page 520

Themembers of the class CashRegister are listedbelowand shown in Figure 8-19.

Instance
Variables

private int cashOnHand;

Constructors
and Methods

public CashRegister()
//Default constructor
//To set the cash in the register 500 cents
//Postcondition: cashOnHand = 500;

public CashRegister( int cashIn)
//Constructor with parameters
//Postcondition: cashOnHand = cashIn;

public int currentBalance()
//Method to show the current amount in the cash register
//Postcondition: The value of the instance variable
// cashOnHand is returned

public void acceptAmount( int amountIn)
//Method to receive the amount deposited by
//the customer and update the amount in the register
//Postcondition: cashOnHand = cashOnHand + amountIn

CashRegister

-cashOnHand: int

+CashRegister()
+CashRegister( int )
+currentBalance(): int
+acceptAmount( int ): void

FIGURE 8-19 UML class diagram of the class CashRegister

Next, we give the definitions of the methods to implement the operations of the
class CashRegister . The definitions of these methods are simple and easy to
follow.
The method currentBalance shows the current amount in the cash register. The
amount stored in the cash register is in cents. Its definition is:

public int currentBalance()
{

return cashOnHand;

}