networking - tcp session in java -

i want connect morethan 1 client @ time server , communicate server clients. how server recognize each client. , how send data particular client?

consider , there 3 clients a,b,c. clients connected server. server wants send message b. how done ?

if understand right - need not bind socket 1 connection. client code looks that:

client class:

public class tcpclient {   public tcpclient(string host, int port) {          try {             clientsocket = new socket(host, port);         } catch (ioexception e) {             system.out.println(" not connect on port: " + port + " " + host);         } } 

server(host) class:

   public class tcplistener {      public tcplistener(int portnumber) {             try {                 serversocket = new serversocket(portnumber);             } catch (ioexception e) {                 system.out.println("could not listen on port: " + portnumber);             }             system.out.println("tcplistener created!");                     system.out.println("connection accepted");             try {                 while (true) {                     socket clientconnection = serversocket.accept();      //every time client's class constructor called - line above executed , new connection saved socket class.                 }             } catch (exception e) {                 e.printstacktrace();             }     } 

that simplest example. more can found here: http://www.oracle.com/technetwork/java/socket-140484.html