java - läsa obj från fil.

/*
 * Skriva en StringBuilder till fil;
 **/
StringBuilder sb = new StringBuilder();
sb.add("Yey!");
sb.add("I'm going to be read back to Java!");

ObjectOutputStream oos = new ObjectOutputStream(
                              new BufferedOutputStream(
                                          new FileOutputStream("FILEN.DAT")
                              )
                    );
oos.writeObject(sb);
oos.close();


/*
 * Läsa in StringBuilder igen;
 **/
ObjectInputStream ois = new ObjectInputStream(
                             new BufferedInputStream(
                                          new FileInputStream("FILEN.DAT")
                             )
                    );
StringBuilder sb = (StringBuilder)ois.readObject();
ois.close();

System.out.println(sb.toString());