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I am a bit ashamed to say that I don't know much about generics but I thank you for your help and will study it further.

Thanks a lot. It is working but as I said I got this warning for every program and example I try, even the ones shown in the Oracle documents that's why I am confused. Anyway what I am trying to do...

Hope someone can help me understand what is happening:

I decided to use a JComboBox in my program and I got this message: "USES UNCHECKED OR UNSAFE OPERATIONS" So I checked online and tried...