// This program prompts the user for a file or directory name and shows
// a listing of all files and directories that can be reached from it
// (including subdirectories).

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

public class DirectoryCrawler {
	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		System.out.print("directory or file name? ");
		String name = console.nextLine();
		File f = new File(name);
		if (!f.exists()) {
	 		System.out.println("That file or directory does not exist");
		} else {
			crawl(f);
		}
	}
	
	// Prints information about this file,
	// and (if it is a directory) any files inside it
	public static void crawl(File f) {
		crawl(f, "");	// call private recursive helper
	}
	
	// Recursive helper to implement crawl/indent behavior.
	private static void crawl(File f, String indent) {
		System.out.println(indent + f.getName());
		if (f.isDirectory()) {
			// recursive case; print contained files/dirs
			for (File subFile : f.listFiles()) {
				crawl(subFile, indent + "	");
			}
		}
	}	
}