UDPServer.java

package SocketProgram;


import java.io.IOException;
//import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
class UDPServer
{
   public UDPServer(){
	   System.out.println("UDP server started");
	   try(DatagramSocket serverSocket = new DatagramSocket(9003))
		{
		   
	   
           byte[] receiveData = new byte[1024];
           byte[] sendData = new byte[1024];
           
           
           System.out.println("Server started");
           while(true)
              {
                
           	DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
           	
           	serverSocket.receive(receivePacket);
               //modified
           	String sentence = new String( receivePacket.getData(),receivePacket.getOffset(), receivePacket.getLength()); 
               
               System.out.println("RECEIVED: " + sentence);
               
               InetAddress IPAddress = receivePacket.getAddress();
               int port = receivePacket.getPort();
               String capitalizedSentence = sentence.toUpperCase();
               sendData = capitalizedSentence.getBytes();
               DatagramPacket sendPacket =
               new DatagramPacket(sendData, sendData.length, IPAddress, port);
               System.out.println("Server is running on port "+ port);
               serverSocket.send(sendPacket);
               System.out.println("UDP Server terminating");
              }
	   }catch(SocketException e){
       	System.out.println("Socket: " + e.getMessage());
       }
       catch(IOException e){
       	System.out.println("IO: " + e.getMessage());
       }
       finally{
       	//if(serverSocket != null)
       		//serverSocket.close();
       }
   }
	public static void main(String args[]) throws Exception
      {
		new UDPServer();
      }
}