/**
 * Remove an entire folder including sub-folders.
 *
 * @param folder to delete
 * @return true if everything deleted
 */
public static boolean deleteFolder(File folder) {
    if (folder.isDirectory()) {
        String[] children = folder.list();
        if (children != null) {
            for (String element : children) {
                boolean success = deleteFolder(new File(folder, element));
                if (!success) {
                    return false;
                }
            }
        }
    }
    return folder.delete();
}