~~~ package io.a8; import java.io.*; public class Test { public static void main(String[] args) { ObjectOutputStream osc = null; ObjectInputStream osr = null; Student ss = new Student("悟空", 007, 95.5f); Student ss2 = null; try { FileOutputStream wsc = new FileOutputStream("e:/ccc.txt"); osc = new ObjectOutputStream(wsc); osc.writeObject(ss); osr = new ObjectInputStream(new FileInputStream("e:/ccc.txt")); ss2 = (Student)osr.readObject(); //readObject()用于读取数据，并且要进行类型转换 System.out.println("姓名："+ss2.xingming); System.out.println("学号："+ss2.xuehao); System.out.println("成绩："+ss2.chengji); } catch (Exception e) { System.out.println("出现错误"); } finally//finally的作用是善后 { try { osc.close(); osr.close(); System.exit(-1); } catch (Exception e) { System.exit(-1); } }//finally下面的try..catch都要写上起到退出作用的话 }//如果try..catch的后面有finally，那么try..catch不要写退出程序的代码 } class Student implements Serializable //接口是空的，起到标准作用 { String xingming = null; int xuehao = 0; transient float chengji = 0; //transient的作用是忽略，外界传不过来数据 public Student(String xingming, int xuehao, float chengji) { this.xingming=xingming; this.xuehao=xuehao; this.chengji=chengji; } } ~~~  并且e盘中ccc.txt文件显示