I am a java developer and want to buy a laptop for programming only.I am not sure what type of a laptop is good for a java proffessional.Has any body has suggestion on this?I liked the dell studio xps 13 configuration and looks but not sure about dell studio 15 if it is good enough performance wise.Which one you will prefer?
Go for the xps. It is damn good with portability and a serious machine for some good development. My friend has that and never heard of any complaints so far. On the other side, you might also try having a look at the new Lenovo notebook series. They have the new T series T410, T510, T410s, T510s which means the prices of the already existing T400, T400s and T500 should be a little down. So if you can afford a little bit more, then I'd say Lenovo is the machine to have. I have a Lenovo R61 which will be two years old by this May and till now I haven't faced even a minor performance problem with this machine. It is very robust built and a great value for money.
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I have used a Dell XPS laptop but only for gaming. Though the performance was good I managed to burn its battery in a year.
As an aside and if have not read it already, you might also want to read this
14" should be very much ideal with respect to portability. Some of my friends who have a 15.4" screens find them too big to fit into most of the backpacks. Check the one from Lenovo as I mentioned in the posts above and they have a better quality for the screen resolution. I guess all depends on the graphics card and the make of the machine. With the models from Lenovo, I guess it should do fine.