1   /**
    2    * A class to test a CashRegister class.
    3    */
    4   
    5   public class CashRegisterTester {
    6   
    7     public static void main(String[] args) {
    8       CashRegister register = new CashRegister();
    9       double price1, price2;
   10       double payment;
   11       price1 = 29.50;
   12       price2 = 9.25;
   13       payment = 50.00;
   14   
   15       register.recordPurchase(29.50);
   16       register.recordPurchase(9.25);
   17       register.enterPayment(50);
   18   
   19       double change = register.giveChange();
   20       System.out.printf("Your change is %.2f. Have a nice day!\n", change);
   21               
   22       System.exit(0);
   23     }
   24   }

Note: After line 16, this program cannot access the total purchase amount although it is stored in the member

      register.purchase
   

because purchase is private.