java中的transient（转）

转：http://www.blogjava.net/liuganquan/archive/2011/08/09/112591.html

Java中的transient，看jdk源码的时候突然忘了这个是什么了，查了一下，是用于声明序列化的时候不被存储的，在这里记下

import java.io.*;

import java.util.*;

 

class Logon implements Serializable {

private Date date = new Date();

private String username;

private transient String password;

 

Logon(String name, String pwd) {

username = name;

password = pwd;

}

 

public String toString() {

String pwd = (password == null) ? "(n/a)" : password;

return "logon info: \n " + "username: " + username + "\n date: "

+ date.toString() + "\n password: " + pwd;

}

 

public static void main(String[] args) {

Logon a = new Logon("Hulk", "myLittlePony");

System.out.println("logon a = " + a);

try {

ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream(

"Logon.out"));

o.writeObject(a);

o.close();

// Delay:

int seconds = 5;

long t = System.currentTimeMillis() + seconds * 1000;

while (System.currentTimeMillis() < t)

;

// Now get them back:

ObjectInputStream in = new ObjectInputStream(new FileInputStream(

"Logon.out"));

System.out.println("Recovering object at " + new Date());

a = (Logon) in.readObject();

System.out.println("logon a = " + a);

} catch (Exception e) {

e.printStackTrace();

}

}

}