browsing folders in a folder

Question

I want to open a folder which has multiple sub-folders in it. Each sub-folder has some files. I want to open a specific file number(lets say 3rd file in each folder) and manipulate it. Can someone help, since I am not able to figure it out from other threads.

Thanks in Advance

isDirectory() function to check for subdirectories... and listFiles() to get list of all files ... — TheLostMind, Jan 15 '14 at 09:58

Sudhanshu Umalkar · Accepted Answer · 2014-01-15T10:09:48.063

4

Please try the code below, it recursively iterates over the contents of the folder and lets you read/manipulate the 3rd file-

public void openAndManipulateFile(final File root) {

    // get the list of files/folders
    final File[] files = root.listFiles();
    int counter = 0;

    for (File file : files) {

        // if its a directory, read its contents
        if (file.isDirectory()) {
            // recursive method call
            openAndManipulateFile(file);
        } else {
            if (++counter == 3) {
                // open and manipulate the 3rd file
            }
        }
    }
}

To call it -

    File rootFolder = new File("some folder");
    openAndManipulateFile(rootFolder);

edited Jan 15 '14 at 10:09

answered Jan 15 '14 at 10:00

Sudhanshu Umalkar

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+1, thats look like a good answer. but please check this out http://meta.stackexchange.com/q/148272. – Not a bug Jan 15 '14 at 10:05
Hi, thanks. What do you mean when you say "To call it"?-does it mean to open the file and use it? – user2285526 Jan 15 '14 at 10:18
To initiate the process, you can pass the base folder to that method. – Sudhanshu Umalkar Jan 15 '14 at 10:23

score 0 · Answer 2 · answered Jan 15 '14 at 10:01

Use this to read all files from a directory

File folder = new File("/Users/you/folder/");
File[] listOfFiles = folder.listFiles();

Iterate over the listOfFiles and check with isDirectory() if the item is a directory. If yes you can use the same procedure to look into the sub-folders.

browsing folders in a folder

2 Answers2