This is the 3rd try for Chapter 12 Exercise 28 Java

I have this code

/********************************************************************************* * (Rename files) Suppose you have a lot of files in a directory named * * Exercisei_j, where i and j are digits. Write a program that pads a 0 before i * * if i is a single digit. For example, a file named Exercise2_1 in a directory * * will be renamed to Exercise02_1. In Java, when you pass the symbol * from the * * command line, it refers to all files in the directory (see Supplement III.V). * * Use the following command to run your program. * *********************************************************************************/ package Renamefiles; import java.io.File; public class Rename_Files { public static void main(String[] args) { renameFiles(args); // renaming filesnames that are passed as arguments on command prompt } private static void renameFiles(String[] fileNames) { //Array fileNames has all files to be renamed. for (String fileName : fileNames) { // for each fileName in fileNames array, rename if such file exist. if (fileName.matches("Exercise\\d_\\d+\\.\\w+")) { // if fileName has the format given in problem then only rename it StringBuilder stringBuilder = new StringBuilder(fileName); //Create a StringBuilder for fileName so that it becomes mutable. stringBuilder.insert(fileName.indexOf('_') - 1, "0"); // insert 0 before one position of '_' symbol in fileName stringBuilder. new File(fileName).renameTo(new File(stringBuilder.toString())); //perform rename operation on file } } } }

I have Exercise1_1.txt Exercise1_2.txt Exercise1_3.txt in the same folder as the Rename_Files.java

and I made a package Renamefiles that uses this code. I just cannot get the command prompt to come up and the code will not rename the files.

I am using jGRASP CSD java

Can you help me rename the files? from a command prompt?

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