for that you have to write two programs like this..
server program :

import java.net.*;
import java.io.*;
public class servereg{
    public static void main(String s1[])throws IOException{
        ServerSocket s=null;
        Socket con=null;
        PrintWriter pr=null;
        BufferedReader br=null;
    try{
        s=new ServerSocket(5000);
        con=s.accept();
    }catch(Exception e){
        e.printStackTrace();}
        pr=new PrintWriter(con.getOutputStream());
        br=new BufferedReader(new InputStreamReader(con.getInputStream()));
        String msg;
    while((one=br.readLine())!=null){
        System.out.println("msg:"+one);
    }
    con.close();

}
}