UDP_Server.java

import java.io.*;
import java.net.*;
  
class UDPServer {
  public static void main(String args[]) throws Exception
    {
  
      DatagramSocket serverSocket = new DatagramSocket(9876);
  
      byte[] receiveData = new byte[1024];
      byte[] sendData  = new byte[1024];
  
      while(true)
        {
  
          DatagramPacket receivePacket =
             new DatagramPacket(receiveData, receiveData.length);
           serverSocket.receive(receivePacket);

          String sentence = new String(receivePacket.getData());
  
          InetAddress IPAddress = receivePacket.getAddress();
  
          int port = receivePacket.getPort();
  
                      String capitalizedSentence = sentence.toUpperCase();

          sendData = capitalizedSentence.getBytes();
  
          DatagramPacket sendPacket =
             new DatagramPacket(sendData, sendData.length, IPAddress,
                               port);
  
          serverSocket.send(sendPacket);
        }
    }
}  
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