Using Collections and Strings in a Reusable Class - Java Programming: Comprehensive Concepts and Techniques - page 586

52 jbtAddPswd.addActionListener ( this ) ;

53 jbtChangePswd.addActionListener ( this ) ;

54 jbtUsePswd.addActionListener ( this ) ;

55
56 JPanel pswdPanel= new JPanel ( new BorderLayout ( 10,10 )) ;

57 pswdPanel.add ( label1, BorderLayout .WEST ) ;

58 pswdPanel.add ( pswdField, BorderLayout .EAST ) ;

59
60 JPanel newPswdPanel= new JPanel ( new BorderLayout ( 19,19 )) ;

61 newPswdPanel.add ( label2, BorderLayout .WEST ) ;

62 newPswdPanel.add ( newPswdField, BorderLayout .EAST ) ;

63
64 JPanel buttonPanel= new JPanel ( new FlowLayout ()) ;

65 buttonPanel.add ( jbtAddPswd ) ;

66 buttonPanel.add ( jbtChangePswd ) ;

67 buttonPanel.add ( jbtUsePswd ) ;

68
69 JPanel contentPanel= new JPanel ( new FlowLayout ()) ;

70 contentPanel.add ( pswdPanel ) ;

71 contentPanel.add ( newPswdPanel ) ;

72 contentPanel.add ( buttonPanel ) ;

73 setContentPane ( contentPanel ) ;

74
75 // Enable Enter key for each JButton so user can tab to button

76 // and press the Enter key, rather than click button with mouse

77 InputMap map;

78 map = jbtAddPswd.getInputMap () ;

79 if ( map != null ){

80 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, false ) , "pressed" ) ;

81 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, true ) , "released" ) ;

82 }

83 map = jbtChangePswd.getInputMap () ;

84 if ( map != null ){

85 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, false ) , "pressed" ) ;

86 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, true ) , "released" ) ;

87 }

88 map = jbtUsePswd.getInputMap () ;

89 if ( map != null ){

90 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, false ) , "pressed" ) ;

91 map.put ( KeyStroke.getKeyStroke ( KeyEvent .VK_ENTER,0, true ) , "released" ) ;

92 }

93 }

94
95 public void centerOnScreen ( int width, int height )

96 {

97 int top, left, x, y;

98
99 // Get the screen dimension

100 Dimension screenSize = Toolkit .getDefaultToolkit () .getScreenSize () ;

101
102 // Determine the location for the top left corner of the frame

103 x = ( screenSize.width - width ) /2;

104 y = ( screenSize.height - height ) /2;

105 top = ( x < 0 ) ? 0 : x;

106 left = ( y < 0 ) ? 0 : y;

107
108 // Set the frame to the specified location

109 this .setLocation ( top, left ) ;

110 }

111
112 public void actionPerformed ( ActionEvent e )

113 {

114 String msg;

115 String title;

116 int optionType;

117 try

118 {

119 if ( e.getSource () == jbtUsePswd ) // user clicked Use password

120 {

121 pswd = new String ( pswdField.getPassword ()) ; // get current pswd entered

122 password.validate ( pswd ) ;

123

FIGURE 9-43

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