GeoTools developers have released the 2.6.2 version. GeoTools contains an incredible amount of utilities related to GIS and I am totally impressed by the feature set.
To give an example of its use, here is some sample code from gisgraphy-java-client ( a simple Java client I am writing for the open source GISgraphy project). It calculates the orthodromic distance between two coordinates :
public double distance(GisFeatureGeography o, Unit unit) {
Unit targetUnit = (unit != null) ? unit : SI.METER;
com.vividsolutions.jts.geom.Geometry me = location;
com.vividsolutions.jts.geom.Geometry other = o.getLocation();
try {
return SI.METER
.getConverterTo(targetUnit)
.convert(JTS.orthodromicDistance(
me.getCoordinate(),
other.getCoordinate(),
DefaultGeographicCRS.WGS84));
} catch (TransformException e) {
throw new RuntimeException(e);
}
}
Please note that the code makes use of two excellent libraries : JTS for geographical types, and JScience for units. And for your information, WGS84 is a friendly name to refer to the GPS coordinate system (x,y,z).