why nullPointerException here

Discussion in 'Java' started by sunn, Sep 16, 2011.

  1. sunn

    sunn

    Joined:
    Sep 16, 2011
    Messages:
    1
    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
     

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    sunn, Sep 16, 2011
    #1
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