Could I do the coordinate transformation by this library?

For example,I have a series coordinates of a polyline. And the coordinates is based on WGS84. However,when I use the calculateLength2D method for polyline. It seems that it gives the plane result using Euclidean Metric. However,this result is not meaningful. So I reckon that it should be firstly projected to a plane coordinates (unit:m). So that I can calculate the length of this polyline?
So how to do coordinate transformation in this library? Or I have to use other library such as GeoTools?
Thanks a lot