首先创建一个学生类

`import java.io.Serializable;

public class Student implements Serializable {

private static final long serialVersionUID = 42L;

private String name;

//private int age;

private transient int age;

public Student() {

}

public Student(String name, int age) {

this.name = name;

this.age = age;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

// @Override

// public String toString() {

// return "Student{" +

// "name='" + name + ''' +

// ", age=" + age +

// '}';

// }

}`

然后创建一个序列化流和反序列化流

1、用对象序列化流序列化了一个对象后，假如我们修改了对象所属的类文件，读取数据会不会出问题呢？

java.io.InvalidClassException:

当序列化运行时检测到类中的以下问题之一时抛出。

类的串行版本与从流中读取的类描述符的类型不匹配

该类包含未知的数据类型

该类没有可访问的无参数构造函数

com.itheima_03.Student; local class incompatible:

stream classdesc serialVersionUID = -3743788623620386195,

local class serialVersionUID = -247282590948908173

2、如果出问题了，如何解决呢？

给对象所属的类加一个值：private static final long serialVersionUID = 42L;

3、如果一个对象中的某个成员变量的值不想被序列化，又该如何实现呢？

private transient int age;

`

import java.io.*;

/*

*/

public class ObjectStreamDemo {

public static void main(String[] args) throws IOException, ClassNotFoundException {

//write();

read();

}

//反序列化

private static void read() throws IOException, ClassNotFoundException {

ObjectInputStream ois = new ObjectInputStream(new FileInputStream("oos.txt"));

Object obj = ois.readObject();

Student s = (Student) obj;

System.out.println(s.getName() + "," + s.getAge());

}

//序列化

private static void write()throws IOException {

ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("oos.txt"));

Student s = new Student("林青霞",30);

oos.writeObject(s);

oos.close();

}

}

`