Help Needed Client Server Paradigm

Question

Hi everybody,
I am trying to make a server that will broadcast a message on the lan and get the reply from a client, but at the stage where I am know I am stuck with the broadcasting part
here is my code, so if anybody can help please do ...
import java.net.*;
import javax.swing.*;
import java.io.*;
import java.awt.event.*;
public class gui {
     JFrame frame;
     JPanel panel;
     JButton button1,button2;
     JTextArea area;
     JScrollPane pane;
     Thread thread;
     //MulticastSocket socket;
     public static void main(String[] args) {
     gui u = new gui();
     public gui (){
     frame = new JFrame("Broadcast Server");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frame.setUndecorated(true);
     frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
     panel = new JPanel();
     panel.setLayout(null);
     area = new JTextArea();
     button1 = new JButton("Start");
     button1.setBounds(210, 10, 75, 40);
     button1.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent e){
          (new Thread(new StartServer())).start();
     panel.add(button1);
     button2 = new JButton("Stop");
     button2.setBounds(300, 10, 75, 40);
     button2.addActionListener(new ActionListener(){
     public void actionPerformed(ActionEvent ae){
     area.append("Server is stopped\n");
     thread.interrupt();
     //     socket.close();
     button1.setEnabled(true);
     button2.setEnabled(true);
     panel.add(button2);
     pane = new JScrollPane(area);
     pane.setBounds(10, 60, 365, 250);
     panel.add(pane);
     frame.add(panel);
     frame.setSize(400, 400);
     frame.setVisible(true);
     public class StartServer implements Runnable
          private static final String 10.0.0.1 = null;
               public void run()
               try {
          //     private long FIVE_SECONDS = 5000;
               protected DatagramSocket socket = null;
          //     DatagramSocket socket = new DatagramSocket();
               socket = new DatagramSocket(4445);
               byte[] buf = new byte[256];
               String FirstContact;
          FirstContact = "Hello";
     buf = FirstContact.getBytes();
          InetAddress group = InetAddress.getByName("10.0.0.1");
     DatagramPacket packet = new DatagramPacket(buf, buf.length, group, 4445);
               socket.send(packet);
          //area.append("Hello from a thread!\n");
          area.append("Server is started\n");
I am getting this exception
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
     at gui.main(gui.java:21)

Answer 1

EmilKTH wrote:
Exception in thread "main" java.lang.Error: Unresolved compilation problem: You're trying to run a program that doesn't even compile yet.
Step back a step and look at the output of the compiler and scan the errors it reports. Fix those before you try to run your code.
Edit: and in the future, please use the code tags when posting code (simply select your code and push the CODE button just above the text area).