// serialization/Logon.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Demonstrates the "transient" keyword
import java.util.concurrent.*;
import java.io.*;
import java.util.*;
import onjava.Nap;

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;
 }
 @Override
 public String toString() {
 return "logon info: \n username: " +
 username + "\n date: " + date +
 "\n password: " + password;
 }
 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.dat"))
 ) {
 o.writeObject(a);
 } catch(IOException e) {
 throw new RuntimeException(e);
 }
 new Nap(1);
 // Now get them back:
 try(
 ObjectInputStream in = new ObjectInputStream(
 new FileInputStream("Logon.dat"))
 ) {
 System.out.println(
 "Recovering object at " + new Date());
 a = (Logon)in.readObject();
 } catch(IOException | ClassNotFoundException e) {
 throw new RuntimeException(e);
 }
 System.out.println("logon a = " + a);
 }
}
/* Output:
logon a = logon info:
 username: Hulk
 date: Tue May 09 06:07:47 MDT 2017
 password: myLittlePony
Recovering object at Tue May 09 06:07:49 MDT 2017
logon a = logon info:
 username: Hulk
 date: Tue May 09 06:07:47 MDT 2017
 password: null
*/