JAVA PROGRAM  Chapter 4. Homework Assignment (read instructions carefully) Write a program that asks the user for the name of a file. The program should read all the numbers from the given file and display the total and average of all numbers in the following format (three decimal digits): Total: nnnnn.nnn Average: nnnnn.nnn

import java.io.*;
import java.util.Scanner;

public class FileTotalAndAverage {
   
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Please enter the file name: ");
        while (true) {
            String fileName = scanner.nextLine();
            File file = new File(fileName);
            if (file.exists() && file.isFile()) {
                processFile(file);
                break;  // Exit loop if file is found and processed
            } else {
                System.out.println("File '" + fileName + "' does not exist.\nPlease enter the file name again: ");
            }
        }
        scanner.close();
    }

    private static void processFile(File file) {
        try {
            Scanner fileScanner = new Scanner(file);
            double total = 0;
            int count = 0;
            while (fileScanner.hasNextDouble()) {
                double number = fileScanner.nextDouble();
                total += number;
                count++;
            }
            fileScanner.close();
            double average = (count == 0) ? 0 : total / count;
            System.out.printf("Total: %.3f%n", total);
            System.out.printf("Average: %.3f%n", average);
        } catch (FileNotFoundException e) {
            // This block should never be reached as we checked if the file exists before
            System.err.println("Unexpected error: " + e.getMessage());
        }
    }
}