상대 경로를 절대 경로로 바꿔주기

    public static String getCanonicalPath(String relative, String base) {
        String canonicalPath = null;

        File relativeFile = new File(relative);
        if(relativeFile.isAbsolute()) {
            canonicalPath = relativeFile.getAbsolutePath();
        } else {
            File canonicalFile = new File(base, relative);

            try {
                canonicalPath = canonicalFile.getCanonicalPath();
            } catch(IOException e) {
                e.printStackTrace();
            }
        }

        return canonicalPath;
    }

FilePathParser.getCanonicalPath("../../temp.txt", "/Users/Stylekai/Documents/");