Folders and Directories

Collections

Note: A File object does not compare as expected when used as a key in a map. Better to convert the folder into a normalised string format before using as a key. For sample code:

../../misc/howto/java/FolderCompare.java.txt

Create a folder/directory…

String newFolderPath = "C:\\";
String newFolderName = "MyFolder";
String spoonFeeding = newFolderPath + newFolderName;
File f = new File(spoonFeeding);
f.mkDir();

From http://forum.java.sun.com/thread.jspa?threadID=516569&messageID=2462611

Check if a folder/directory exists:

// From com.mycompany.lucene.RepositoryWriter
private void checkIndexDoesNotExist(final File repositoryFolder) throws MyException {
    if (repositoryFolder.isDirectory()) {
        throw new MyException("Index already exists [" + repositoryFolder.getAbsolutePath() + "]");
    }
}

Create a Folder

void createFolder(final File folder) {
    if (!folder.isDirectory()) {
        folder.mkdir();
    }
}

Create the folder and any nonexistent parent directories.

if (!new File(folder).mkdirs()) {
    throw new MyException("Cannot create folder [" + folder + "]");
}

Delete a Folder

• Delete Folder in Apache, Commons IO: Commons IO.

• Deleting a Directory

  // Deletes all files and subdirectories under dir.
  // Returns true if all deletions were successful.
  // If a deletion fails, the method stops attempting to delete and returns false.
  public static boolean deleteDir(File dir) {
      if (dir.isDirectory()) {
          String[] children = dir.list();
          for (int i=0; i<children.length; i++) {
              boolean success = deleteDir(new File(dir, children[i]));
              if (!success) {
                  return false;
              }
          }
      }
  
      // The directory is now empty so delete it
      return dir.delete();
  }