在java中能夠被序列化的類必須先實現Serialzable介面，該介面沒有任何抽象方法只是起到一個標記作用。

//物件輸出流
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("D://obj")));
oos .writeObject(new User("zhangxiaosan",100));
ObjectOutputStream .close();


//物件輸入流
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new
 
 File("D://obj")));
User user = (User)ois.readObject();
System.out.println(user);
ois.close();