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Thanks to Norm, I got advise from Fubarable in Java Programming Forum - The Front Page

I re-build my classes again.

thanks a lot for your help.

Thanks to copeg, I also got notices from other Moderators in different java 4rums when I return today.
I only want to archive the answer for my problem much faster but Cross Posting rules let me...

I found a way to solve the problem with instanceof

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then the error will never be blown up again (^^)

1625

However, I face with another problem is, after entering a keyword then click...

The errors are shown below:

This section is duplicated, please can admin delete this section for me please.

Dear all,

I have been doing a small program which can help user search general photos by keywords and can retrieve most recent general uploads from Flickr.

I created 4 classes:
...