Java developers

I've been having trouble with the first pixel-looking or illegible. I thought I'd done something stupid. So I built a small example to isolate the problem.

Then by accident I found the cause: creating the objects on the right thread. Can you guess which thread is "right"? Here's the code and some sample output.
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Any ideas why this happens? I have a work-round (add one to the JTextField's preferred width), but I'd like an explanation.

Hi. Another quick question:

I have an array of randomly generated numbers, which I need to sort through to see whether the same number occurs twice or more. How can I do this?

I know I can sort the array into ascending order, but I just cant get my head around how to then tell it to check if the same number occurs twice.

Thanks!