//: Logon.java
//////////////////////////////////////////////////
// Copyright (c) Bruce Eckel, 1998
// Source code file from the book "Thinking in Java"
// All rights reserved EXCEPT as allowed by the
// following statements: You can freely use this file
// for your own work (personal or commercial),
// including modifications and distribution in
// executable form only. Permission is granted to use
// this file in classroom situations, including its
// use in presentation materials, as long as the book
// "Thinking in Java" is cited as the source.
// Except in classroom situations, you cannot copy
// and distribute this code; instead, the sole
// distribution point is http://www.BruceEckel.com
// (and official mirror sites) where it is
// freely available. You cannot remove this
// copyright and notice. You cannot distribute
// modified versions of the source code in this
// package. You cannot use this file in printed
// media without the express permission of the
// author. Bruce Eckel makes no representation about
// the suitability of this software for any purpose.
// It is provided "as is" without express or implied
// warranty of any kind, including any implied
// warranty of merchantability, fitness for a
// particular purpose or non-infringement. The entire
// risk as to the quality and performance of the
// software is with you. Bruce Eckel and the
// publisher shall not be liable for any damages
// suffered by you or any third party as a result of
// using or distributing software. In no event will
// Bruce Eckel or the publisher be liable for any
// lost revenue, profit, or data, or for direct,
// indirect, special, consequential, incidental, or
// punitive damages, however caused and regardless of
// the theory of liability, arising out of the use of
// or inability to use software, even if Bruce Eckel
// and the publisher have been advised of the
// possibility of such damages. Should the software
// prove defective, you assume the cost of all
// necessary servicing, repair, or correction. If you
// think you've found an error, please email all
// modified files with clearly commented changes to:
// Bruce@EckelObjects.com. (Please use the same
// address for non-code errors found in the book.)
/////////////////////////////////////////////////
// Demonstrates the "transient" keyword
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();
}
}
} ///:~ |