🚀 go-pugleaf

I am trying to create an echo server, here is my (buggy) source code:
import java.io.*;
import java.util.*;
import java.net.*;

public class n {

public static void main(String args[]) throws IOException {
ServerSocket ssok = new ServerSocket(7);
Thread theSvr;
while (true) {
System.out.println("Server: Listening on port 7");
Socket sok = ssok.accept();
System.out.println("Server: Connection Request recieved");
Svr nooSvr = new Svr(sok);
theSvr = new Thread(nooSvr);
theSvr.start();
}
}
}
class Svr implements Runnable {
Socket sok;
public Svr(sok) throws IOException {
}
public void run() {
Socket sock = sok;
DataInputStream inbound = new DataInputStream(sock.getInputStream());
DataOutputStream outbound = new DataOutputStream(sock.getOutputStream());
String inLine = inbound.readline();
}
}

On compiling it says a) Identifier expected
                                         public Svr(sok) throws IOException
{
                                                                  ^

                                    b)Wrong number of arguments in
constructor.
                                        Svr nooSvr = new Svr(sok);
                                                                ^

Can anyone tell me how to fix it???
                James