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Sample Codes (Java)
/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*::                                                                         :*/
/*::  This routine calculates the distance between two points (given the     :*/
/*::  latitude/longitude of those points). It is being used to calculate     :*/
/*::  the distance between two locations using GeoDataSource (TM) prodducts  :*/
/*::                                                                         :*/
/*::  Definitions:                                                           :*/
/*::    South latitudes are negative, east longitudes are positive           :*/
/*::                                                                         :*/
/*::  Passed to function:                                                    :*/
/*::    lat1, lon1 = Latitude and Longitude of point 1 (in decimal degrees)  :*/
/*::    lat2, lon2 = Latitude and Longitude of point 2 (in decimal degrees)  :*/
/*::    unit = the unit you desire for results                               :*/
/*::           where: 'M' is statute miles (default)                         :*/
/*::                  'K' is kilometers                                      :*/
/*::                  'N' is nautical miles                                  :*/
/*::  Worldwide cities and other features databases with latitude longitude  :*/
/*::  are available at http://www.geodatasource.com                          :*/
/*::                                                                         :*/
/*::  For enquiries, please contact sales@geodatasource.com                  :*/
/*::                                                                         :*/
/*::  Official Web site: http://www.geodatasource.com                        :*/
/*::                                                                         :*/
/*::           GeoDataSource.com (C) All Rights Reserved 2017                :*/
/*::                                                                         :*/
/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/

import java.util.*;
import java.lang.*;
import java.io.*;

class DistanceCalculator
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "M") + " Miles\n");
		System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "K") + " Kilometers\n");
		System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "N") + " Nautical Miles\n");
	}

	private static double distance(double lat1, double lon1, double lat2, double lon2, String unit) {
		double theta = lon1 - lon2;
		double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
		dist = Math.acos(dist);
		dist = rad2deg(dist);
		dist = dist * 60 * 1.1515;
		if (unit == "K") {
			dist = dist * 1.609344;
		} else if (unit == "N") {
			dist = dist * 0.8684;
		}

		return (dist);
	}

	/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
	/*::	This function converts decimal degrees to radians						 :*/
	/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
	private static double deg2rad(double deg) {
		return (deg * Math.PI / 180.0);
	}

	/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
	/*::	This function converts radians to decimal degrees						 :*/
	/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
	private static double rad2deg(double rad) {
		return (rad * 180 / Math.PI);
	}
}

The sample code is licensed under LGPLv3.