Socket help?

Question

Alright I have to modify these two programs for a school project. However I can't even get the ones she gave us up and running. So it's obvious that I can't modify them until I get the ones she gave us up and running. Any help that you could give me would be awesome.
The error I get is java.net.ConnectException: Connection refused: connect
Exception in thread "main" java.lang.NullPointerException
     at DateClient.main(DateClient.java:29)
The programs are, please don't ask me what they do that's why I need the first one up and running. All I know is that we are supposed to send information through a socket. Thanks for the help.
  import java.net.*;
   import java.io.*;
    public class DateClient
       public static void main(String[] args) throws IOException {
         InputStream in = null;
         BufferedReader bin = null;
         Socket sock = null;
         try {
            sock = new Socket("127.0.0.1",6013);
            in = sock.getInputStream();
            bin = new BufferedReader(new InputStreamReader(in));
            String line;
            while( (line = bin.readLine()) != null)
               System.out.println(line);
             catch (IOException ioe) {
               System.err.println(ioe);
         finally {
            sock.close();
   }This is the second one:
import java.net.*;
import java.io.*;
public class DateServer
     public static void main(String[] args) throws IOException {
          Socket client = null;
          ServerSocket sock = null;
          try {
               sock = new ServerSocket(6013);
               // now listen for connections
               while (true) {
                    client = sock.accept();
                    System.out.println("server = " + sock);
                    System.out.println("client = " + client);
                    // we have a connection
                    PrintWriter pout = new PrintWriter(client.getOutputStream(), true);
                    // write the Date to the socket
                    pout.println(new java.util.Date().toString());
                    pout.close();
                    client.close();
          catch (IOException ioe) {
                    System.err.println(ioe);
          finally {
               if (sock != null)
                    sock.close();
               if (client != null)
                    client.close();
     }

Answer 1

'javac' is not recognized as an internal or external command,
operable program or batch file.
This is what I get when I attempt to compile it in the command prompt.
hi :-)
kidz now are having problems with DOS. they dont even know what DOS means. same problem was asked. i think it was yesterday :-( huhu :-(
by the way try this solutions
1. add your java folder to your Environment File PATH
or
2. directly access the javac from its folder
ex. C:\Program Files\Java\jdk1.5.0_08\bin\javac filename.javaalternatively you can put that line of code on a batch file,
so you will no longger type that long directory structure.
regards,