Multiplayer in localhost

[asdfg]

I have downloaded XAMPP and I use localhost.

Can I make my program accessible for someone who isnt using my network?

I mean : other user from diffrend city, could connect to my program and use it?

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class JAVAXx extends Application {
	
	 int x = 0;
	 int y = 100;
    
	@Override
    public void start(Stage primaryStage) 
    {   		

     Rectangle myHero = new Rectangle (50,50);
     myHero.setTranslateY(100);
     
  	 	  	  	
	 Group multipleComponents = new Group();	
	 multipleComponents.getChildren().addAll(myHero);     

      
     Scene scene = new Scene(multipleComponents, 600, 400);
     primaryStage.setScene(scene);
     primaryStage.show();
     
     scene.setOnKeyPressed(e -> {
    	    if (e.getCode() == KeyCode.W) 
    	    {
    	    	y -= 20;
    	        myHero.setTranslateY(y); 
    	    }
    	    if (e.getCode() == KeyCode.S) 
 	    	{
 	    		y += 20;
 	    		myHero.setTranslateY(y);  
 	    	}
    	    if (e.getCode() == KeyCode.A) 
 	    	{
    	    	x -= 20;
    	    	myHero.setTranslateX(x);   
 	    	}
    	    if (e.getCode() == KeyCode.D) 
 	    	{
    	    	 x += 20;
    	    	 myHero.setTranslateX(x);    
 	    	}
    	});

    }
        
    public static void main(String[] args) 
    {
        launch(args);
    }
}

This is small example of moving around rectangle with WASD. So I wish that I would I could click W and S, while other user could click A and D.

[jim829]

The localhost address is simply the loopback address of the PC one is using. So it doesn't make sense to me to have some access
that address from outside. But I am not familiar with the app and how its used. normally, to let someone access your laptop remotely
you need to:

1. Provide them the ISP side address of your LAN.
2. Ensure any required ports are not blocked by your router or ISP.
3. Ensure the PC is listening for incoming traffic on that port.
4. And you will need to direct traffic for the specific port to a specific IP address since otherwise the
router will not know to which IP to forward the traffic.

Regards,
Jim