My Machines IP Address? (not my routers)

Question

I have an application listening to port 8080 on my machine. This machine has ip address 192.168.1.5 (say) on my LAN. This LAN is then connected to the Internet via a modem and router. This modem and router has ip address 12.34.567.890 (say) on the internet.
How do I connect to my application, i.e. what is the address of my machine on the Internet?
Or does my machine have to be the one directly connected to the Internet?
Any Help with this would be great.
Tom

Answer 1

import java.io.*;
import java.net.*;
public class Server {
     // removed 'int portNo' because it is not needed as the port number can be passed and accessed with the serverSocket object.
     ServerSocket serverSocket;
     Socket clientSocket;
     PrintWriter out;
     BufferedReader in;
     public static void main(String args[]) {
          try {
               new Server();
          } catch(IOException e) {
               e.printStackTrace();
     public Server() throws IOException {
          serverSocket = new ServerSocket(8080);
          clientSocket = serverSocket.accept();
          out = new PrintWriter(clientSocket.getOutputStream());
          in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
          String currStr = null;
          if (in.ready()) {
               for(currStr = in.readLine(); !currStr.equals("finish"); currStr = in.readLine()) {
                    out.println(currStr);
                    System.out.println("echo: " + currStr);
          } else {
               System.out.println("Could not read from client. Client input not ready.");
          out.flush(); // added this to ensure that all of the data in the buffer is sent before closing the stream.
          out.close();
          in.close();
          clientSocket.close();
          serverSocket.close();
}