java对象序列化

一    java的对象序列化

    eg .

import java.io.*;
import java.util.*;
public class Logon implements Serializable {
private Date date = new Date();
private String username;
private transient String password;
public 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 + "\n password: " + pwd;
}

public static void main(String[] args) throws Exception {
Logon a = new  Logon("Hulk", "myLittlePony");
System.out.println( "logon a =" +a);

ObjectOutputStream o = new ObjectOutputStream(
new FileOutputStream("Logon.out"));
o.writeObject(a);  
o.close();
Thread.sleep(1000); // Delay for 1 second
// 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);
}
} ///:~

 

结果： 只有被transient修饰的password没有被序列化。