Hi, I have a problem programming with the JavaCard

Hello,
I am new to JavaCard programming.
I have a problem stucked in adding new class to the sample program "wallet".
I want to add a tag-on / off function that allows the calculation of journey fee when the card holder tags off.
I have no idea of writing the program.
Can anyone give me some ideas or tips?
Thank you.

See:
* http://windows.microsoft.com/en-US/windows7/The-Language-bar-overview The Language bar (overview)
It is possible that you have switched the keyboard layout by accident.
* Make sure that you have the Language bar visible on the Windows Taskbar.
* You can do that via the right-click context menu of the Taskbar: Toolbars > Language Bar.
* Check the keyboard language (keyboard layout) setting for the application that has focus via the icon on the Language bar.
* You need to do that while Firefox has focus because Windows remembers the keyboard layout setting per application.
* The default keys to rotate the layout is a combination (Ctrl+Shift or Alt+Shift) that can easily be used in Firefox to activate a menu item.
* To avoid an unintentional switch assign a specific key sequence (Alt/Ctrl+Shift+number) to select keyboard layouts and remove the key combination to rotate layouts (Alt+Shift or Ctr+Shift)
Control Panel > Regional and Language Options > Keyboards and Languages > Change keyboards > Advanced key settings > Change key sequence

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