code: public static boolean disjoint(Geometry geometry1, Geometry geometry2,
  			SpatialReference spatialReference) {
  		OperatorDisjoint op = (OperatorDisjoint) factory
  				.getOperator(Operator.Type.Disjoint);
  		boolean result = op.execute(geometry1, geometry2, spatialReference,
  				null);
  		return result;
  	}
docs: See OperatorDisjoint.