Recursively create directory

Question

Does anyone know how to use Java to create sub-directories based on the alphabets (a-z) that is n levels deep?

 /a
    /a
        /a
        /b
        /c
           


        

Answer 1

You could use three loops over characters a-z like so:

import java.io.*;

public class FileCreate {

    public static void main(String[] args) throws Exception {
        char trunkDirectory = 'a';
        char branchDirectory = 'a';
        char leaf = 'a';

        while (trunkDirectory != '{') {
            while (branchDirectory != '{') {
                while (leaf != '{') {
                    System.out.println(trunkDirectory + "/" + branchDirectory + "/" + leaf++);
                }
                leaf = 'a';
                branchDirectory++;
            }
            branchDirectory = 'a';
            trunkDirectory++;
        }

    }
}

This simply outputs the paths to the console. You could use File#mkdirs() to create a recursive directory structure or create the directories in each intermediate part of the nested loop. I'll leave that for you to finish.