java语言编程IO流之对象序列化和ObjectInputStream与ObjectOutputStream

import java.io.*;

public class TestObjectStream {
 public static void main(String[] args) {
  T t = new T();
  t.name = "jay chou";
  FileOutputStream fos = null;
  ObjectOutputStream oos = null;
  FileInputStream fis = null;
  ObjectInputStream ois = null;
  try {
    fos= new FileOutputStream("D:\\bak\\test.dat");
    oos = new ObjectOutputStream(fos);
    oos.writeObject(t);
    oos.writeDouble(0.1);
    oos.flush();//不加这一句，有可能出现异常java.io.EOFException
    
    fis = new FileInputStream("D:\\bak\\test.dat");
    ois = new ObjectInputStream(fis);
    T tt = (T)ois.readObject();
    double d = ois.readDouble();
    System.out.println(tt);
    System.out.println(d);
  } catch (IOException e) {
    e.printStackTrace();  
  }catch (ClassNotFoundException e) {
    e.printStackTrace(); 
  } finally {
   try {
     ois.close();
     fis.close();
     oos.close();
     fos.close(); 
   } catch (IOException e) {
     e.printStackTrace(); 
   }
     
  }
 
 }
}

class T implements Serializable {//必须实现该接口，才可使用户自定义类可以序列化
 String name = "jay";
 transient int i = 7;
 long t = 10L;
 double d = Math.random();
 char c = 'a';
 
 public String toString() {
  return ("name " + name + " i： " + i + " t：" + t + " d： " + d + " c： " + c);
 }
}
/*
D:\java\io>javac TestObjectStream.java

D:\java\io>java TestObjectStream
name jay chou i： 7 t：10 d： 0.7328874131779102 c： a
0.1

=====================================================

D:\java\io>javac TestObjectStream.java

D:\java\io>java TestObjectStream
name jay chou i： 0 t：10 d： 0.43315260736775785 c： a
0.1

*/