[Q] Calculating distance between two points, using latitude longitude?

I am trying to calculate distance between two points using java code, I have written a code but it is not working. I have checked various forums to get the resolution to my query. I have found specifically posted on this forum and hope I'll get a solution from the member of this community.

Here is code

Code:
final double RADIUS = 6371.01; double temp = Math.cos(Math.toRadians(latA)) * Math.cos(Math.toRadians(latB)) * Math.cos(Math.toRadians((latB) - (latA))) + Math.sin(Math.toRadians(latA)) * Math.sin(Math.toRadians(latB)); return temp * RADIUS * Math.PI / 180;

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