DatagramClient.java

package datagramclient;

import java.net.*;

public class DatagramClient 
{  
    public static void main(String[] args) throws Exception
    {
        DatagramSocket ds=new DatagramSocket(2001); 
        String msg="Hello World";
        DatagramPacket dp=new DatagramPacket(msg.getBytes(),msg.length(),InetAddress.getByName("localhost"),2000);
        
        ds.send(dp);
        
        byte b[]=new byte[1024];
        dp=new DatagramPacket(b,1024);
        ds.receive(dp);
        
        msg=new String(dp.getData()).trim();
        System.out.println("From Server "+msg);
        
        ds.close();
        
        
        
    }
    
}

class Server 
{  
    public static void main(String[] args) throws Exception
    {
        DatagramSocket ds=new DatagramSocket(2000);
        
        byte b[]=new byte[1024];
        DatagramPacket dp=new DatagramPacket(b,1024);
        ds.receive(dp);
        
        String msg=new String(dp.getData()).trim();
        System.out.println("From Client "+msg);
        StringBuilder sb=new StringBuilder(msg);
        sb.reverse();
        msg=sb.toString();

         dp=new DatagramPacket(msg.getBytes(),msg.length(),InetAddress.getByName("localhost"),2001);
        
        ds.send(dp);
 
        ds.close();
    
    }
    
}