DatagramSocket giver runtime Exception

Hvor er sock erklæret og hvor får den en værdi ?

Det er sandsyneligvis den som er null

import java.net.*;

class SendMessagesMain{

    public static void main(String args[]){
   
    try{
    DatagramSocket sock = new DatagramSocket(2000);
    InetAddress remoteAddress =
        InetAddress.getByName("xx.xx.xx.xx");
    int remotePort = 3000;

    UserInput ui = new UserInput(sock,remotePort,remoteAddress);
    ui.start();
       
    byte[] inputBuffer = new byte[sock.getReceiveBufferSize()];
    DatagramPacket dp =
        new DatagramPacket(inputBuffer,inputBuffer.length);
    // Server loop
    while(true){
        sock.receive(dp);
        System.out.println("" + dp.getData());
    }
    }catch(Exception e){System.out.println("bla: " + e);}
    }
}

import java.io.*;
import java.net.*;

public class UserInput extends Thread{
   
    DatagramSocket sock;
    InetAddress remoteAddress;
    int remotePort;

    public UserInput(DatagramSocket sock, int port, InetAddress add){
    try{
    remoteAddress = add;
    remotePort = port;
    sock = new DatagramSocket(port);
    }catch(Exception e){}
    }
   
    BufferedReader bufReader;
    String inputString;
   
    public void run(){
    while(true){
        bufReader = new BufferedReader(new InputStreamReader(System.in));
        try{
        inputString = bufReader.readLine();
        System.out.println("Trying to sendmessage: " + inputString);
        DatagramPacket packet =
        new DatagramPacket(inputString.getBytes(),
                  inputString.getBytes().length,
                  remoteAddress,
                  remotePort);
        System.out.println("" + remoteAddress);
        sock.send(packet);

        }catch(Exception e){System.out.println("UserThread1 : " + e);}
    }
    }
}

ha ha. Har selv set den. Smid et svar

Det skal selvfølgelig være:
    public UserInput(DatagramSocket sock, int port, InetAddress add){
    try{
    remoteAddress = add;
    remotePort = port;
    this.sock = sock;
    }catch(Exception e){}
    }

jep

:-)