latitutdeLongitude.java

public class distanceCalculator
{
    public static final double R = 6372.8;
    public static Information getInformation(double lat1, double long1,
                                             double lat2, double long2)
    {
        double distance = haversine(lat1, long1, lat2, long2);
        String bearing = headingToString2(bearing(lat1, long1, lat2, long2));
        return new Information(distance, bearing);

    }

    public static double haversine(double lat1, double lon1, double lat2, double lon2)
    {
            double dLat = Math.toRadians(lat2 - lat1);
            double dLon = Math.toRadians(lon2 - lon1);
            lat1 = Math.toRadians(lat1);
            lat2 = Math.toRadians(lat2);

            double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2);
            double c = 2 * Math.asin(Math.sqrt(a));
            return R * c;
    }

    protected static double bearing(double lat1, double lon1, double lat2, double lon2)
    {
        double longitude1 = lon1;
        double longitude2 = lon2;
        double latitude1 = Math.toRadians(lat1);
        double latitude2 = Math.toRadians(lat2);
        double longDiff= Math.toRadians(longitude2-longitude1);
        double y= Math.sin(longDiff)*Math.cos(latitude2);
        double x=Math.cos(latitude1)*Math.sin(latitude2)-Math.sin(latitude1)*Math.cos(latitude2)*Math.cos(longDiff);

        return (Math.toDegrees(Math.atan2(y, x))+360)%360;
    }

    public static String headingToString2(double x)
    {
        String directions[] = {"N", "NE", "E", "SE", "S", "SW", "W", "NW", "N"};
        return directions[ (int)Math.round(((x % 360) / 45)) ];
    }

    public static void main(String[] args)
    {
        System.out.println(getInformation(12.58, 77.34, 28.31, 77.2));
        System.out.println(haversine(12.58, 77.34, 28.31, 77.2));
    }
}

class Information
{
    String bearing;
    double distance;
    public Information(double distance, String bearing)
    {
        this.bearing = bearing;
        this.distance = distance;
    }

    public String toString()
    {
        return "" + this.bearing + " " + this.distance + "kms";
    }
}