return new Boolean(f.isDirectory());
return Boolean.valueOf(f.isDirectory());
  public Boolean isTraversable(File f)  {    // Tested. A directory where the user has no permission to rwx is still    // traversable. (No files are listed when you traverse the directory)    // My best guess is that as long as it's a directory, the file is    // traversable.    return new Boolean(f.isDirectory());  }