Question

Write a Java program that lists all the files in a directory and their subdirectories, that mimics the Unix ls command or the Windows dir command. Note that when a directory is encountered we do not immediately print its contents recursively. Rather, as we scan each directory, place any subdirectory in a List. After the directory entries are printed then process each subdirectory recursively. For each file that is listed, include the modification time, the file size, and if it is a directory, have your output say so. For each directory, print the complete directory name prior to printing its contents.

Answer 1

Main.java

import java.io.File;
  
public class Main
{
static void SubDirectories(File[] fl, int lvl)
{
for (File z : fl)
{
for (int x = 0; x < lvl; x++)
System.out.print("\t");
  
if(z.isFile())
System.out.println(z.getName());
else if(z.isDirectory())
{
System.out.println("[" + z.getName() + "]");
SubDirectories(z.listFiles(), lvl + 1);
}
}
}
public static void main(String[] args)
{
String str = "C:\\"; //Enter the directory you want to check the program for
File directories = new File(str);
if(directories.exists() && directories.isDirectory())
{
File fl[] = directories.listFiles();
System.out.println("**********************************************");
System.out.println("Files from main directory : " + directories);
System.out.println("**********************************************");
SubDirectories(fl, 0);
}
}
}

Output: