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exception error

 
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when i come to doing the following code:



i get the following error:
Exception: java.lang.NullPointerException

what does this mean?
 
Bartender
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Is this a continuation of your previous topic?
NullPointerException means you tried to invoke a method on an object reference that has not been initialized. If you print the exception stack trace (there's a method in Exception that does it) it will tell you what line the exception occurred on.
 
mj zammit
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yes yes it does continue from the previous topic.
I found out why it was not outputting the results
now i am trying to fix it...
I shall try out what you have suggested...
 
Don't get me started about those stupid light bulbs.
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