add a variable after the loop.

[Ching Ming]

My code asks for a user to pay for their parking. I would like the user have to ability to add money to the program. So right now the code runs through the loop it just states how much money it would cost. I would like the user to have the ability to add money so that the program ends when the totalAmountCollected - amount of the the user ended so that the program will exit when the balance is 0.  


/

**
   Name: Ally Gator
   Date: 03/21/2015
   Course/Section: IT 106.001
   Assignment: Programming Assignment 6
  
   Description:
  
   This program supports the Parking Office at George Mason University.
   Employees working at the kiosk process customers upon their exit from
   the parking facility. Customers are asked to present their GMU ID, if
   they have one. The number of hours parked is also requested (based on
   whole hours parked, not including partial hours parked). Each customer is
   presented with the amount they owe. When all customers have been processed,
   the total amount of money collected during the employee's shift is displayed.
  
   There are three categories of customers:
   1.  Student
   2.  Faculty or Staff
   3.  Those not affiliated with the university
  
   The amount owed by the customer is $1.50 for each full hour parked in
   addition to a base rate charged determined by the customer's status.  The
   base rates are:
      Students:  			$1.50
    	Faculty/Staff:		$3.00
    	Other:				$5.00
    
   The user is the GMU employee working the kiosk and will be required to input
   for each customer:
   	customer type (given a choice of three values)
   	number of hours parked
   
   The output for each customer will be:
      amount owed
   
   After all customers are processed, the total amount of funds collected
   will be output.
  */

import javax.swing.JOptionPane;
public class Parking {
	public static void main (String[] args) {
		int customerType;
		double hoursParked;
      double amountOwed;
      double totalAmountCollected = 0;

	/*
		Process customers until the user indicates there are no more cars
		to exit the garage.
	*/

		do {
			customerType = getCustomerType();
			hoursParked = getHoursParked();
			amountOwed = calculateAmountOwed(customerType, hoursParked);
			printReceipt(amountOwed);
			totalAmountCollected += amountOwed;
		} while (JOptionPane.showInputDialog(null, "Are there more customers? Enter YES or NO.").equalsIgnoreCase("Yes"));

		JOptionPane.showMessageDialog(null, "Total collected: " + String.format("$%.2f", totalAmountCollected));
	}

	/**
      Continually prompt the user until they choose one of three valid options
      representing the type of the customer within the university (Student, Faculty/Staff,
      or Other -- unaffiliated.
     
      @return the type of customer entered (1: Student; 2: Faculty/Staff; 3: Other)
	  */
	private static int getCustomerType() {
		int customerType;
		do {
         try {
   			customerType = Integer.parseInt(JOptionPane.showInputDialog("Input customer type:\n"
   				+ " 1. Student\n 2. Faculty/Staff\n 3. Other\n"));
         }
         catch (NumberFormatException e) {
            customerType = -1;
         }
         if (customerType < 1 || customerType > 3) {
            JOptionPane.showMessageDialog(null, "Invalid customer type! Please try again.");
         }
		} while (customerType < 1 || customerType > 3);
		return customerType;
	}


	/**
      Continually prompt the user until they enter a valid number of hours parked
      (between 0 and 24) the customer was parked in the garage
     
      @return the number of hours parked in the garage
	  */
	private static double getHoursParked() {
		double hoursParked;
		do {
         try {
   			hoursParked = Double.parseDouble(JOptionPane.showInputDialog("How many hours parked?"));
         }
         catch (NumberFormatException e) {
            hoursParked = -1;
         }
         if (hoursParked < 0 || hoursParked > 24) {
            JOptionPane.showMessageDialog(null, "Invalid number of hours parked! Please try again.");
         }
		} while (hoursParked < 0 || hoursParked > 24);

		return hoursParked;
	}


	/**
      Determine the base amount owed to be charged the customer based
      upon their customer type in the unversity
      
      @param customerType the type of customer (1: Student; 2: Faculty/Staff; 3: Other)
      @return base amount to be charged (Students: $1.50; Faculty/Staff: $3.00; Other: $5.00)
	  */
	private static double calculateCustomerBaseAmount(int customerType) {
		double baseAmount = 0;
      
		switch (customerType) {
			case 1:
            baseAmount = 1.50;
            break;
            
			case 2:
            baseAmount = 3.00;
			   break;
            
			case 3:
            baseAmount = 5.00;
            break;
		}
		return baseAmount;
	}

	/**
      Determine the amount owed by the customer due to the number of hours parked
      The cost is $1.50 for each full hour parked
     
      @param numHours number of full hours parked in the garage (between 0 and 24)
      @return hourly fee to be charged
     */
	private static double calculateHourlyRate(double numHours) {
		return (int)numHours * 1.50;
	}

	/**
	   Calculate the amount owed by the customer including the base amount and the hourly rate
     
      @param customerType the type of customer (1: Student; 2: Faculty/Staff; 3: Other)
      @param numHours the number of hours parked in the garage (between 0 and 24)
      @return the amount owed by the customer as they are leaving the garage
 	  */
	private static double calculateAmountOwed (int customerType, double numHours) {
		return calculateCustomerBaseAmount(customerType) + calculateHourlyRate(numHours);
	}


	/** 
      Print the amount owed by a customer
     
      @return the amount owed by one customer
	  */
	private static void printReceipt(double amountOwed) {
		JOptionPane.showMessageDialog(null, "Please pay " + String.format("$%.2f", amountOwed));
	}
}

[Campbell Ritchie]

Please remind yourself how code tags work; I have added them for you this time, otherwise that code would have been illegible.
Why are you using Option Pane for keyboard input? That is very old‑fashioned style.
Why are all your methods marked static?
Why are you multiplying by 1.5 and then casting to an int in line 148?
How do you think you sh‍ould record the amount paid in the parking machine? Do you simply want a running total of what has been paid?

[Ching Ming]

Well I originally thought there would be a question to ask the user at the beginner do you want to add money or buy services. Adding money and buying services would be their own separate loops. But that is first thing I am confused about can this program be done with only loop or two. Thanks.

[Knute Snortum]

You could use one loop for each question... but can you think of a way to use one loop for all prompts and answers?