1 import java.io.Serializable;2 /*3  * Serializable:用于给被序列化的类加入ID号。4  * 用于判断类和对象是否是同一个版本。 5  */6 public class Person implements Serializable/*标记接口*/ {7     /**8      * transient:非静态数据不想被序列化可以使用这个关键字修饰。 9      */
10     private static final long serialVersionUID = 9527l;
11 //    private transient String name;
12     private  String name;
13 //    private static int age;
14     private int age;
15
16     public Person(String name, int age) {
17         super();
18         this.name = name;
19         this.age = age;
20     }
21     public String getName() {
22         return name;
23     }
24     public void setName(String name) {
25         this.name = name;
26     }
27     public int getAge() {
28         return age;
29     }
30     public void setAge(int age) {
31         this.age = age;
32     }
33 }

 1 public class ObjectStreamDemo {2     /**3      * @param args4      * @throws IOException 5      * @throws ClassNotFoundException 6      */7     public static void main(String[] args) throws IOException, ClassNotFoundException {8         //writeObj();9         readObj();
10     }
11     public static void readObj() throws IOException, ClassNotFoundException {
12         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("obj.object"));
13         //对象的反序列化。
14         Person p = (Person)ois.readObject();
15         System.out.println(p.getName()+":"+p.getAge());
16         ois.close();
17     }
18
19     public static void writeObj() throws IOException, IOException {
20
21         ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("obj.object"));
22         //对象序列化。  被序列化的对象必须实现Serializable接口。
23         oos.writeObject(new Person("小强",30));
24         oos.close();
25     }
26 }

Exception in thread "main" java.io.InvalidClassException: cn.itcast.serializable.Person; local class incompatible: stream classdesc serialVersionUID = 9527, local class serialVersionUID = 7915096815468332737