i want to make a chat app for my TYBScIT project.... which language to go for? i am quite good in core java... n how to start.??

Nothing can beat JAVA.......that doesn't mean .NET is not good,,,,,,,,,, .NET is also superb.........It depends on you that you are comfortable and good on which platform (i.e Java or .NET)...........as you said you are good in core java but you cannot build a chat application using core Java you ne

For chat application u must learn Advance JAVA and then make application on that will give u good mileage in future.

Yes you right, but the core java was very hard language. so,i think you must be project in php or .net ok.