a server program that needs some help :)

hello guys ;
i tried to write a simple server to send /receive strings concurrently through the same port .i used a class with thread which implements runnable.but the problem is the class which has runnable thread doesnt recognise socket object that i created in main class.(btw im akind of new at java so the terms i used as talking might be wrong) .i guess it will make sense when u see the program below. if i use different ports for sending and receiving and define new socket objects in each class will solve the problem but i wonder if there s any way to do that through the same port concurently.if i can work it out.id like to share the proper program ( both server and client codes) with u all. pls feel free to ask any question.i hope i could express whats wrong with the program.
best regards...

import java.io.IOException;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.io.DataInputStream;
import java.io.DataInput;


class MyThreaddd implements Runnable{


Thread t;
MyThreaddd () {
t = new Thread(this,"My thread");
t.start();
}
public void run() {
for(;;) {
//to receive date from client
Scanner sc=new Scanner(s.getInputStream());
String gelen=sc.nextLine();
System.out.println("client:"+gelen);
}
}
}

public class javaserverchat {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

try {
ServerSocket ss=new ServerSocket(25);
System.out.println("server is ready.."+InetAddress.getLocalHost());
Socket s=ss.accept();
System.out.println(s.getInetAddress()+" connected");
PrintStream pr=new PrintStream(s.getOutputStream());

pr.println("hello pal im server:) "); //to send string to the client

new MyThreaddd();

for(;;) {

// to send the string we type to the client

DataInputStream di=new DataInputStream(System.in);
try {
String okunan=di.readLine();
pr.println(okunan); //Client'a mesaj
//System.out.println(okunan);
//System.out.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}




//---------------------------------



//s.close();

}
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("port mesgul");
}

}


}

1. your socket is invisible because it is in a different class, it would be visible if you did something like this:

Code:

---

class Chat{
Socket s;
class YourThread{}
}

---

So the thread class has to be inside the chat class. There are other methods to do this but i think this is the easiest.
2 . Dont use such small port numbers like 25 use ports >2000 , because you dont want to use a port which may be taken by system.
3. I never used scanner for reading lines from , so i dont know if it works well, I rather use BufferedReader, but thats just my preference
4 There is no point in having two ports, you have a connection on one port, and from that connection you get input and output