Need to create this Java program but I'm stuck

invoice_example.txt

order.txt

* order.txt Invoice.java X 10 import java.io.PrintWriter; O2 import java.util.Scanner; 03 import java.io.FileInputStream; #4 import java.io.FileOutputStream; 5 import java.io.IOException; 6 70 /** 8 * This programs must: 9 9 10 1. Read from order.txt and write to invoice.txt. 11 2. Write a header to the output file. 12 3. For each line of the input file: 13 a. Read the quantity, price, and description. 14 b. Compute the extension (quantity * price) 15 c. Format and write these values to the output file using printf. 16 d. Keep track of the running total. 17 4. After all lines have been processed, write the total to the file using printt. 18 19 Refer to AddLineNumbers.java and Reviews.java for pieces needed to develop this program. 20 21 * Do not assume that the input file has a certain number of lines. Your program must 22 * continue reading until the end of the input file is reached. 23 24 Before starting, look at invoice_example.txt to see how the invoice.txt file you are going 25 * to create must be formatted. 26 27 * The first time you run this program, invoice.txt is not going to appear automatically 28 * in Eclipse. To see the file, right-click on the FileIO project and choose Refresh. 29 */ 30 31 public class Invoice 320 public static void main(String[] args) throws IOException { 33 // YOU MUST USE THESE EXACT FILENAMES! Do not change them or your program 34 // will not run correctly for grading. 9235 String inputFileName = "order.txt"; 36 String outputFileName = "invoice.txt"; 37 38 // Insert your logic here 39 40 } 41} 42 LA36 Reviews.java *Invoice.java invoice_example.txt X 1 The following lines show what your invoice.txt file should look like. 2 3 Qty Description Price Ext 4 5 Backpack $ 19.99 $ 99.95 5 10 Paper $0.99 $ 9.90 6 3 Pens $ 1.49 $ 4.47 7 2 Pencils $ 1.19 $ 2.38 9 Total: $ 116.70 10 order.txt X 1$ 19.99 Backpack 2 10 0.99 Paper 33 1.49 Pen 42 1.19 Pencil