Java Fern???

I just picked up a nice piece of what looks like tall Java
fern to me. The pet shop said it was not, it is a type of
sword. It has leaves just like a java, they are about 9"
tall, Grow on a runner and are spaced about 1/2". Oh, and
the large leaves tend to be crinkly. I'm at work, my books
are at home. Any guesses what it is?