private void writeObject(java.io.ObjectOutputStream s)throws java.io.IOException
private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException

package com.imooc.io;
import java.io.Serializable;
public class Student implements Serializable{
  private String stuno;
  private String stuname;
  //该元素不会进行jvm默认的序列化
  private transient int stuage; 
  public Student(String stuno, String stuname, int stuage) {
     super();
     this.stuno = stuno;
     this.stuname = stuname;
     this.stuage = stuage;
  }
  public String getStuno() {
     return stuno;
  }
  public void setStuno(String stuno) {
     this.stuno = stuno;
  }
  public String getStuname() {
     return stuname;
  }
  public void setStuname(String stuname) {
     this.stuname = stuname;
  }
  public int getStuage() {
     return stuage;
  }
  public void setStuage(int stuage) {
     this.stuage = stuage;
  }
  @Override
  public String toString() {
     return "Student [stuno=" + stuno + ", stuname=" + stuname + ", stuage="
         + stuage + "]";
  }
}

package com.imooc.io;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class ObjectSeriaDemo1 {
  public static void main(String[] args) throws Exception{
     String file = "demo/obj.dat";
     //1.对象的序列化
     ObjectOutputStream oos = new ObjectOutputStream(
         new FileOutputStream(file));
     Student stu = new Student("10001", "张三", 20);
     oos.writeObject(stu);
     oos.flush();
     oos.close();
     ObjectInputStream ois = new ObjectInputStream(
         new FileInputStream(file));
     Student stu1 = (Student)ois.readObject();
     System.out.println(stu1);
     ois.close(); 
  }
}