Does Nikon d3100 have electronic viewfinder?

Also what's your opinion on Nikon d3100? Your answer will settle my dilemma so that is whay i say to you thanks loads

No, D3100 has an optical viewfinder.

D3100 is good, but D5100 gets you the same sensor as the D7000.

It has a " through the lens " viewfinder…

Yes, in LiveView, the rear LCD acts as an electronic viewfinder, technically. The traditional peephole is an optical viewfinder as is with the rest of the dSLRs in this world. It's not a dSLR if it's not optical.

The D3100 is a great dSLR that you can use to learn photography but will make you yearn for more features as you get better. It is enough for most shooting conditions especially if you know the basic principles of photography. If you can afford a better camera, something in the level of the D90 or higher, go for it.