import java.util.Scanner;
import java.io.*;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;

public class Ex26SalesReport
{
	public static void main(String[] args) throws IOException
	{
		String filename;
		double totalSales;
		
		//Get the name of the file
		filename = getFileName();
		//Get the total sales
		totalSales = getTotalSales(filename);
		//display the total sales
		displayResults(totalSales);
		
		System.exit(0);
	}
	
	
	public static String getFileName()
	{
		String file;
		file = JOptionPane.showInputDialog("Enter the name of the file\ncontaining days of sales amounts.");
		return file;
	}
	
	public static double getTotalSales(String filename) throws IOException
	{
		double total = 0.0;
		double sales;
		//open the file
		File file = new File(filename);
		Scanner inputFile = new Scanner(file);
		
		while (inputFile.hasNext())
		{
			sales = inputFile.nextDouble();
			total += sales;
		}
		
		inputFile.close();
		return total;
	}
	
	public static void displayResults(double total)
	{
		DecimalFormat dollar = new DecimalFormat("#,###.00");
		JOptionPane.showMessageDialog(null, "The total sales is $"+dollar.format(total));
	}
}