Go back n directories JAVA

gistfile1.txt

private static void downDir(int levels) {
        String oldPath = System.getProperty("user.dir");
        String[] splitedPathArray = oldPath.split("/");
        levels = splitedPathArray.length - levels;
        List<String> splitedPathList = Arrays.asList(splitedPathArray);
        splitedPathList = splitedPathList.subList(0, levels);
        String newPath = String.join("/", splitedPathList);
        System.setProperty("user.dir", newPath);
}
/*
you can call this method and specify number of levels down you want to go in file sys.
*/