Check if a user is root in a java application

Question

How can i verify if a user is root in a java application?

Thanks

Answer 1

String userName = System.getProperty("user.name");
Process p = Runtime.getRuntime().exec("groups " + userName);
String output = read(p.getInputStream());
String error = read(p.getErrorStream());

And here is a read function:

public static String read(InputStream input) throws IOException {
    try (BufferedReader buffer = new BufferedReader(new InputStreamReader(input))) {
        return buffer.lines().collect(Collectors.joining("\n"));
    }
}

Just "another" modified solution.