folder-subfolders, get data

**Questionmark** · 11-05-2009, 07:07 PM

hi everyone,

i'm having the following problem:

i've got a folder (directory C:\Schoolschaak), where my program adds subfolders which have all specified names. In those subfolders, there are some txt files with all the same names (like Name.txt, Age.txt,...)..
now my question is if there is a function which searches in this directory (C:\Schoolschaak) and returns a list of all subfolders in an array?

thanks anyway,

Questionmark =)

**mrmatt1111** · 11-05-2009, 07:52 PM

Review: File

Java Code:

File.listFiles(...);

Java Code:

File.isDirectory();

**Questionmark** · 11-05-2009, 08:45 PM

thanks, but i don't really understand, with this method i can get files and folders, but i need only the names of the folders... or am i just missing it? :p

**travishein** · 11-06-2009, 01:50 AM

yea, you get the names from the File object returned in the array of results as mrmatt1111 said , with the File.getName() method

Java Code:

  /** gets an array of string folder names of things inside a folder that are subdirectories
  public String[] getChildFolderNames(String startFolder) {
    List<String> folderNames = new ArrayList<String>();

    File aFolder = new File(startFolder);
    File[] allFiles = aFolder.listFiles();
    for (File f : allFiles) {
      if (f.isDirectory()) {
        folderNames.add(f.getName());
      }
    }
    return (String[]) folderNames.toArray(new String[0]);
  }

**Questionmark** · 11-06-2009, 08:47 AM

ooh i see xD
thanks a LOT ^^ :D

**r035198x** · 11-06-2009, 09:24 AM

Originally Posted by Questionmark

ooh i see xD
thanks a LOT ^^ :D

You really should have made an effort to read the excellent link that was posted and try to think about how to implement the solution given the methods suggested. Getting copy pastable code may seem helpful to you now but ruins your programming career.

**Questionmark** · 11-06-2009, 02:13 PM

i did... just don't understand the return types of the list functions...
this piece of code stops adding Strings to the array when 1 subfolder has been found, so I have understood and edited the code... it's not that i didn't do the effort of reading that link, it's just that i'm a kid of 15 years old, not speaking English as a motherstongue, trying to program java and not able to understand all explications that have been given...

**r035198x** · 11-06-2009, 02:22 PM

What did you edit it to do? Care to share what you did?

**Questionmark** · 11-06-2009, 02:41 PM

it doesn't work as i want it to, it gives still an error, but i'm working on it.
something like this, but it's one complete mess. doesn't work at all, but only have been busy 20 mins :p tonight i'll try harder =)

public static String[] getChildFolderNames(String startFolder) {
List<String> folderNames = new ArrayList<String>();

File aFolder = new File(startFolder);
File[] allFiles = aFolder.listFiles();
int numberOfFiles = allFiles.length;
File[] f;
int i = 0;
f = aFolder.listFiles();
do{
i++;
if (f[i].isDirectory()) {
folderNames.add(f[i].getName());
subfoldersindir ++;
}
}while (i<numberOfFiles);
return (String[]) folderNames.toArray(new String[0]);
}

public static int GetNOFID() {
int returnint = subfoldersindir;
subfoldersindir = 0;
return subfoldersindir;
}

}

**Questionmark** · 11-06-2009, 02:42 PM

ignore the GetNOFID ^^

**r035198x** · 11-06-2009, 05:06 PM

If you want to get all folders and sub folders then think recursion.

**Questionmark** · 11-08-2009, 02:12 PM

hey, good idea :D i'll give it a try :)

**Questionmark** · 11-08-2009, 03:34 PM

hmm, did it without recursion ;)
it was the list that gave a lot of errors, probably me not understanding the list completely :p but i changed the list into an array of Strings and the returntype into String[], and changed a few things, like the condition of the for loop, and now it works =)

Java Code:

 public static String[] getChildFolderNames(String startFolder) {
	 		subfoldersindir = 0;
	 		String[] folderNames = {null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null};
	 	   File aFolder = new File(startFolder);
		    File[] allFiles = aFolder.listFiles();
		  int i = 0;
		  int a = 0;
			int numberOfFiles = allFiles.length;
			File[] f = allFiles; 
		    for (i=0; i<numberOfFiles; i++) {
		      if (f[i].isDirectory()) {
		    	 
		        folderNames[a] = f[i].getName();
		        subfoldersindir ++;
		        a++;
		      }
		    }
		    return folderNames;

**Questionmark** · 11-08-2009, 03:37 PM

don't mention the values of 'folderNames', it gave errors (out of bounds) ^^

**Fubarable** · 11-08-2009, 04:21 PM

Originally Posted by travishein

yea, you get the names from the File object returned in the array of results as mrmatt1111 said , with the File.getName() method

Another way to get just folders is to use a FileFilter:

Java Code:

  public static File[] getSubDirectories(File file) {
    FileFilter filter = new FileFilter() {

      public boolean accept(File pathname) {
        if (pathname == null) {
          return false;
        }
        return pathname.isDirectory();
      }
      
    };
    return file.listFiles(filter);
  }

**Fubarable** · 11-08-2009, 04:23 PM

Originally Posted by Questionmark

public static String[] getChildFolderNames(String startFolder) {
subfoldersindir = 0;
String[] folderNames = {null,null,null,null,null,null,null,null,null,null ,null,null,null,null,null,null,null,null,null,.... .....

What the heck??? Sorry, but that code should be taken out back and shot.

**Questionmark** · 11-08-2009, 06:17 PM

Originally Posted by Fubarable

What the heck??? Sorry, but that code should be taken out back and shot.

do you know a way to have those null values disappear? I was just glad I found a function that worked xD yes, I was annoyed with it too, but i can't seem to find any other way. i'll try yours =)

**Questionmark** · 11-08-2009, 06:27 PM

i need a function that returns the names of the folders, so if you work this example out to a function that returns an array of Strings, you'll have the same outofboundsexception, and in my case to make it work I just added those null values... is there another way to have my code without the null values?

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