Add a running total as you add items to the list for this program:

import java.text.DecimalFormat;

import java.util.ArrayList;

import javax.swing.JOptionPane;

public class BudgetProgram {

public static void main(String[] args) {

// Created an array

ArrayList items = new ArrayList();

DecimalFormat format = new DecimalFormat("#.00");

String input;

double budget, taxRate;

try {

// Setting budget

input = JOptionPane.showInputDialog("Please enter your budget amount.");

budget = Double.parseDouble(input);

// Tax

input = JOptionPane.showInputDialog("Please enter the tax rate (%).");

taxRate = Double.parseDouble(input);

// Items and price

while (!input.equalsIgnoreCase("Q")) {

input = JOptionPane.showInputDialog("Please enter item name (Q to stop)");

if (!input.equalsIgnoreCase("Q")) {

// Creates an item

Item item = new Item();

item.name = input;

input = JOptionPane.showInputDialog("Please enter item price");

item.price = Double.parseDouble(input);

// Adds item to an array

items.add(item);

}

}

// Creating a total price summary

String summary = "Items entered: " + items.size() + " ";

double totalPrice = 0;

for (Item itm : items) {

//item info

summary += itm.name + ", $" + itm.price + " ";

totalPrice += itm.price;

}

summary += "Price: $" + totalPrice + " ";//price

totalPrice += totalPrice * taxRate / 100.0;//adding tax

summary += "Including tax: $" + totalPrice + " ";//price with tax

summary += "Budget: $" + budget + " ";//budget

if (totalPrice > budget)

{

// print if it is over budget

summary += "Over budget by: $" + (format.format(totalPrice - budget)) + " extra ";

}

else

{

// print if it is under budget

summary += "Under budget with: $" + (format.format(budget - totalPrice)) + " left ";

}

// print the summary

JOptionPane.showMessageDialog(null, summary);

} catch (Exception e) {

// if an invalid input is entered, like a letter for price

JOptionPane.showMessageDialog(null, "Invalid input!");

}

}

}

//Class to get item to work

class Item {

String name;

double price;

}