### Question:
MapDistance { public static double getDistance(double lng1, double lat1, double lng2, double lat2) { double radLat1 = rad(lng1); double radLat2 = rad(lng2); double difference = radLat1 - radLat2; double mdifference = rad(lat1) - rad(lat2); double distance = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(difference / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(mdifference / 2), 2))); distance = distance * EARTH_RADIUS; distance = Math.round(distance * 10000) / 10000; return distance; }  static double getDistance(double lng1, double lat1, double lng2, double lat2); static Map<String, Double> getAround(double lng, double lat, double raidusMile); static final double EARTH_RADIUS; }### Answer:
@Test public void testGetDistance() { assertEquals(MapDistance.getDistance(116.327396, 39.938416, 120.332685, 37.617222), 462.0); assertEquals(MapDistance.getDistance(120.332685, 37.617222, 116.327396, 39.938416), 462.0); }