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What have you tried?

Are you using an IDE for this?

I figured as much but I couldn't tell if the guy was foreign and couldn't type in English well so I didn't want to be rude XD

What is connectionn supposed to be, and in the code you gave us populateComboBox() doesn't exist.

When having multiple constructors the compiler can only tell the difference by the parameters, since both constructors use only a single int the compiler cannot tell the difference and throws an...

Sorry about that totally spaced out when I read that. Have you tried just adding a few bullets into the list first to see if that was the problem? Same thing with aliens?

What line does the compiler say there is an error?

How is it not working? Is there an error?

What exactly is wrong with it?

This is most likely the wrong section to ask this question. I don't know how good you are at programming but I would start with making a simple chat program using Sockets and build off of that.