Using Collections and Strings in a Reusable Class - Java Programming: Comprehensive Concepts and Techniques - page 585

JPassword fields
automatically
replace mask
characters with
asterisks

PasswordDemo
program

FIGURE 9-42

1 /**
2 * Class PasswordDemo used to test class Password
3 *
4 * @author Michael Mick
5 * @version 1.0
6 */
7 import javax.swing.*;
8 import java.awt.*;
9 import java.awt.event.*;
10
11 public class PasswordDemo
12 {
13 public static void main ( String [] argv )

14 {

15 int width = 400;

16 int height = 130;

17 final demoFrame f = new demoFrame ( "PasswordDemo" ) ;

18
19 f.pack () ;

20 f.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE ) ;

21 f.setSize ( width, height ) ;

22 f.centerOnScreen ( width, height ) ;

23 f.setVisible ( true ) ;

24 }

25 }
26
27 class demoFrame extends JFrame implements ActionListener
28 {
29 Password password = null ;

30 String pswd, newPswd;

31
32 JPasswordField pswdField;

33 JPasswordField newPswdField;

34 JButton jbtAddPswd, jbtChangePswd, jbtUsePswd;

35
36 public demoFrame ( String title )

37 {

38 super ( title ) ; // call super (JFrame) constructor

39
40 JLabel label1 = new JLabel ( "Current Password:" ) ;

41 pswdField = new JPasswordField ( 20 ) ;

42 pswdField.setEchoChar ( '*' ) ;

43
44 JLabel label2 = new JLabel ( "New Password:" , JLabel.RIGHT ) ;

45 newPswdField = new JPasswordField ( 20 ) ;

46 newPswdField.setEchoChar ( '*' ) ;

47
48 jbtAddPswd = new JButton ( "Add password" ) ;

49 jbtChangePswd = new JButton ( "Change password" ) ;

50 jbtUsePswd = new JButton ( "Use password" ) ;

51

FIGURE 9-43

(continued)