I think someone could understand object oriented concepts and event drivent programming concepts quite well, either form reading about them or being familiar with them in one language. That persone could them start trying to program in Java/Eclipse or C#/VS, and, with the aid of the IDE, effectively implement the program idea they have in their mind. Being able to program without an IDE is usually a function of being very familiar with the language's syntax, but syntax and programming concepts are different things.