//ファイルに保存
SampleObj obj = new SampleObj();//impl Serializable
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("serialized_object"));
out.writeObject(obj);
out.close();
//ファイルから復元
ObjectInputStream in = new ObjectInputStream(new FileInputStream("serialized_object"));
SampleObj obj = (SampleObj) in.readObject();
in.close();