If my class has a non-empty constructor, is it possible to auto-complete parameters in the new expression?
With Eclipse, if you press ctrl+
There's no such possibility yet. As IDEA doesn't fill the arguments automatically, distinguishing the constructors in the lookup makes no sense. There's a request for that (http://youtrack.jetbrains.net/issue/IDEABKL-5496) although I sincerely believe such a behavior is too dangerous and error-prone.