Java GuardedObject read

import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.security.GuardedObject;

public class Main {
   public static void main(String[] args) throws Exception {
      ObjectInputStream ois = new ObjectInputStream(new FileInputStream("pass"));
      GuardedObject go = (GuardedObject) ois.readObject();
      String pass = (String) go.getObject();
      System.out.println("pass = " + pass);
   }// w w  w .j  a  va2s.c  om
}