USER-DEFINED CLASSES AND ADTS - Java Programming: From Problem Analysis to Program Design - page 528

e. Update the amount in the cash register.
f. Sell the product—that is, decrement the number of items in the
dispenser by 1 .
g. Display an appropriate message.
2. If the dispenser is empty, tell the user that this product is sold out.
The definition of the method sellProduct is:

public static void sellProduct(Dispenser product,
CashRegister cRegister)

{

int price; //variable to hold the product price

int coinsInserted; //variable to hold the amount entered

int coinsRequired; //variable to show the extra amount

//needed

if (product.getCount() > 0) //Step 1

{

price = product.getProductCost(); //Step 1a

coinsRequired = price; //Step 1b

coinsInserted = 0; //Step 1c

while (coinsRequired > 0) //Step 1d

{

System.out.print("Please deposit "
+ coinsRequired
+ " cents: "); //Step 1d.i

coinsInserted = coinsInserted
+ console.nextInt(); //Step 1d.ii

coinsRequired = price
- coinsInserted; //Step 1d.iii

}

System.out.println();

cRegister.acceptAmount(coinsInserted); //Step 1e

product.makeSale(); //Step 1f

System.out.println("Collect your item "
+ "at the bottom and "
+ "enjoy.\n"); //Step 1g

}
else
System.out.println("Sorry this item "
+ "is sold out.\n"); //Step 2

} //end sellProduct