ChatUDP.java

import javax.sound.sampled.Port;
import javax.swing.*;
import java.awt.*;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.nio.charset.StandardCharsets;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ChatUDP extends JFrame {
    private JTextArea taMain;
    private JTextField tfMsg;

    private  final  String FRM_TITLE = "Tiny Chat";
    private final int FRM_LOC_X = 100;
    private final int FRM_LOC_Y = 100;
    private final int FRM_WIDTH = 400;
    private final int FRM_HEIGHT = 400;

    private final  int PORT = 9876;
    private final   String IP_BROADCAST = "192.168.50.255";


    private class thdReceiver extends Thread {
  @Override
        public void start(){
      super.start();
      try {
          customize();
      } catch (Exception ex) {
          ex.printStackTrace();
      }

  }
  private void customize() throws Exception{
 DatagramSocket receiveSocket = new DatagramSocket(PORT);

 while (true){
     byte [] receiveData = new byte [4096];
     DatagramPacket receivePacket = new DatagramPacket(receiveData,receiveData.length);
     receiveSocket.receive(receivePacket);
     String sentence = new String(receivePacket.getData());
     taMain.append(IP_BROADCAST.toString()+":"+PORT+": ");
         taMain.append(sentence);
         taMain.append("\r\n");
         taMain.setCaretPosition(taMain.getText().length());
 }
        };
    }
    private  void btnSend_Handler() throws Exception {
        DatagramSocket sendSocket = new DatagramSocket();
        InetAddress IPAddress = InetAddress.getByName(IP_BROADCAST);
        byte[] sendData;
        String sentence = tfMsg.getText();
        tfMsg.setText("");
        sendData = sentence.getBytes("UTF-8");
        DatagramPacket sendPacket = new DatagramPacket(sendData,sendData.length,IPAddress,PORT);
        sendSocket.send(sendPacket);
     }
    private void framDraw (JFrame frame){
tfMsg = new JTextField();
taMain = new JTextArea(FRM_HEIGHT/19, 50);
 JScrollPane spMain = new JScrollPane(taMain);
 spMain.setLocation(0,0);
 taMain.setLineWrap(true);
 taMain.setEditable(false);

 JButton btnSend = new JButton();
 btnSend.setText("Send");
        btnSend.setToolTipText("Broadcast a message");
        btnSend.addActionListener(e -> {
            try {
                btnSend_Handler();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        });

        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setTitle(FRM_TITLE);
        frame.setLocation(FRM_LOC_X,FRM_LOC_Y);
        frame.setSize(FRM_WIDTH,FRM_HEIGHT);
        frame.setResizable(false);
        frame.getContentPane().add(BorderLayout.NORTH,spMain);
        frame.getContentPane().add(BorderLayout.CENTER,tfMsg);
        frame.getContentPane().add(BorderLayout.EAST,btnSend);
        frame.setVisible(true);
    }
    private void antistatic(){
        framDraw(new ChatUDP());
        new thdReceiver().start();

    }
    public static void main (String [] args){
 new ChatUDP().antistatic();
    }
}