prova con
Vector v = new Vector();
PipedOutputStream pos = new PipedOutputStream();
try {
PipedInputStream pis = new PipedInputStream(pos);
ObjectOutputStream oos = new ObjectOutputStream(pos);
ObjectInputStream ois = new ObjectInputStream(pis);
oos.writeObject(v);
Vector V = (Vector)ois.readObject();
} catch (IOException ex) {
} catch (ClassNotFoundException ex) {
}