How to subtract or add two coordinates

Question

I am trying to subtract and add two coordinates of two cities. I would like to do this in a void method. What are your suggestions, how should I do this?

For example:

I would like to subtract coordinates of city1 (x1, y1) with city2(x2, y2) and then call it in main class. So how to do it?

I have written this code below, but it is not working or I don't know how to call it...

Main class:

public class Main {

public static void main(String[] args) {
    
        Coordinates paris = new Coordinates(48.830103, 2.562957);
        Coordinates rioDeJaneiro = new Coordinates(-22.492147, -43.143827);

Coordinates class:

 public class Coordinates {

    private double latitude;
    private double longitude;

    public Coordinates(double latitude, double longitude) {
        this.latitude = latitude;
        this.longitude = longitude;
    }

    public double getLatitude() {
        return this.latitude;
    }

    public double getLongitude() {
        return this.longitude;
    }

     public void subtract(Coordinates otherCoordinates) {
           new Coordinates(this.latitude - otherCoordinates.getLatitude(),
                            this.longitude - otherCoordinates.getLongitude());
     }

Answer 1

your code won't work as you expect. Your subtract method supposed to be something like below

public void subtract(Coordinates otherCoordinates) {
                this.latitude = this.latitude- otherCoordinates.getLatitude();
                this.longitude = this.longitude- otherCoordinates.getLongitude();
 }

if latitude and longitude are immutable then

public Coordinates subtract(Coordinates otherCoordinates) {
           return  new Coordinates(this.latitude - otherCoordinates.getLatitude(), 
                                    this.longitude - otherCoordinates.getLongitude());
  }