[JAVA] SERVER CLIENT UDP

import java.net.*;

public class UDPServer {

    public static void main(String[] args) throws Exception {

        DatagramSocket socket = new DatagramSocket(54321); // Listen on port 54321

        System.out.println("UDP Server listening on port 54321...");

        byte[] buffer = new byte[1024];

        DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

        socket.receive(packet); // Receive a UDP packet

        String receivedMessage = new String(packet.getData(), 0, packet.getLength());

        System.out.println("Received from client: " + receivedMessage);

        // Optional: Send a response

        InetAddress clientAddress = packet.getAddress();

        int clientPort = packet.getPort();

        String response = "UDP response from server!";

        byte[] responseData = response.getBytes();

        DatagramPacket responsePacket = new DatagramPacket(responseData, responseData.length, clientAddress, clientPort);

        socket.send(responsePacket);

        socket.close();

    }

}