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import java.io.*;
import java.net.*;
class UDPServer
{
	public static DatagramSocket serversocket;
	public static DatagramPacket dp;
	public static BufferedReader br;
	public static InetAddress ia;
	public static byte buf[] = new byte[1024];
	public static int cport = 222,sport=555;
	public static void main(String[] args) throws IOException
       {
         serversocket = new DatagramSocket(sport);
         dp = new DatagramPacket(buf,buf.length);
         br = new BufferedReader (new InputStreamReader(System.in));
         ia = InetAddress.getLocalHost();
 
         System.out.println("Server is Running...");
         while(true)
         {
          serversocket.receive(dp);
          String str2 = new String(dp.getData(), 0, dp.getLength());
          if(str2.equals("exit"))
          {
           System.out.println("Terminated...");
           break;
          }
          System.out.println("Client said : " + str2);
 
          String str3 = new String(br.readLine());
          buf = str3.getBytes();
          serversocket.send(new DatagramPacket(buf,str3.length(), ia, cport));
         }
       }
    }

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import java.io.*;
import java.net.*;
class UDPClient
{
	public static DatagramSocket clientsocket;
	public static DatagramPacket dp;
	public static BufferedReader br;
	public static InetAddress ia;
	public static byte buf[] = new byte[1024];
	public static int cport = 222, sport = 555;
	public static void main(String[] args) throws IOException
	{
		clientsocket = new DatagramSocket(cport);
		dp = new DatagramPacket(buf, buf.length);
		br = new BufferedReader(new InputStreamReader(System.in));
		ia = InetAddress.getLocalHost();
		  
		System.out.println("Client is Running...");
		System.out.println("Type some text if u want to Quit type 'exit'.");
		while(true)
		{
			String str1 = new String(br.readLine());
			buf = str1.getBytes();
			if(str1.equals("exit"))
			{
				System.out.println("Terminated..");
				clientsocket.send(new DatagramPacket(buf,str1.length(),ia,sport));
				break;
			}
			clientsocket.send(new DatagramPacket(buf,str1.length(), ia, sport));
			 
			clientsocket.receive(dp);
			String str4 = new String(dp.getData(), 0, dp.getLength());
			System.out.println("Server said : " + str4);
		}
	}
}