public  Object deepClone() throws IOException, ClassNotFoundException{        //将对象写到流里        ByteArrayOutputStream bos = new ByteArrayOutputStream();        ObjectOutputStream oos = new ObjectOutputStream(bos);        oos.writeObject(this);        //从流里读回来        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());        ObjectInputStream ois = new ObjectInputStream(bis);        return ois.readObject();    }