public void guardarDatos(){
		try
		{
			FileOutputStream fileOut = new FileOutputStream("usuario.ser",true);
			ObjectOutputStream out = new ObjectOutputStream(fileOut);
			out.writeObject(this);
			out.close();
			fileOut.close();
			System.out.println("datos guardados en usuario.ser");
		}catch (IOException i)
		{
			i.printStackTrace();
		}
	}