I appreciate all the help given by the members of this forum.Thanks
people.
iam developing a chat server.I need to extract the
Username ,ClientIPaddress ,ClientPortNumber from various clients and
store them in a array.How can i do this?
In this program the datagram recieved by the server contains the
login, ipaddress and port no .How can i put them in a array? what
method should i be using to extract the info?? can sombody help?

----------------------------------------------------
import java.io.*;
import java.net.*;

class UDPServer1
{
public static void main(String args[]) throws Exception
{
String Ctrl1;
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(),"ASCII");
//String login[] = new String(sentence);
for(int i =0;i>=login.length;i++)
{
if(login[i].equals(login[i+1]))
{
Ctrl1="UnSuccessful" ;
}
else
{
Ctrl1 ="Sucess" ;
}
};
InetAddress IPAddress =
receivePacket.getAddress();
System.out.println(IPAddress);

int port = receivePacket.getPort();

sendData = Ctrl1.getBytes();
DatagramPacket sendPacket = new
DatagramPacket(sendData,sendData.length,IPAddress,port);
serverSocket.send(sendPacket);

}
}
}