why nullPointerException here


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Sep 16, 2011
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Hello,
in attachment i put two files one of them is applet contain two buttons and the other file is not applet and has one button to make refresh for the applet ( i wont to refresh the applet from another class) but when i press the b3 button nullPointerException appears , why ???
and how can i go back to the first screen ( which contains the two buttons ) by a button in the other screen ( which contain the one button)????
please help me as quickly as you can
 

Attachments

  • but.txt
    539 bytes · Views: 331
  • tryclass.txt
    888 bytes · Views: 322
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