Hi Friend,

We are providing you a code that will prompt the user to enter the latitude and longitude coordinates of the source and destination and accordingly return the distance between them.

import java.util.*;

public class CalculateDistance{
public static void main(String args[]){
System.out.println("Enter the Longitude and Latitude of Source location:");
Scanner input=new Scanner(System.in);
double lat1=input.nextDouble();
double long1=input.nextDouble();
System.out.println("Enter the Longitude and Latitude of destination location:");
double lat2=input.nextDouble();
double long2=input.nextDouble();
CalculateDistance cal=new CalculateDistance();
double dist=cal.distance( lat1, -long1 ,lat2 , -long2, 'K');
System.out.println(dist + " Kilometers\n");
}

public static double distance(double lat1, double lon1, double lat2, double lon2, char unit) {
double theta = lon1 - lon2;
double dist = Math.sin(degreeToRadian(lat1)) * Math.sin(degreeToRadian(lat2)) + Math.cos(degreeToRadian(lat1)) * Math.cos(degreeToRadian(lat2)) * Math.cos(degreeToRadian(theta));
dist = Math.acos(dist);
dist = radianToDegree(dist);
dist = dist * 60 * 1.1515;
if (unit == 'K') {
dist = dist * 1.609344;
}
return (dist);
}
private static double degreeToRadian(double deg) {

return (deg * Math.PI / 180.0);
}
private static double radianToDegree(double rad) {
return (rad * 180.0 / Math.PI);
}

}

Thanks