why nullPointerException here

Thread starter sunn
Start date Sep 16, 2011

sunn

Sep 16, 2011

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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