Java based ChatRoom Coding.

 
//ChatMate.java , The client code
// 
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.applet.*;
import java.io.*;
import javax.swing.*;
import java.util.*;
import java.util.Date;
import java.util.GregorianCalendar;
public class ChatMate extends Applet implements ActionListener, Runnable
{
 String hms,dmy,am_pm;
 String tempmsg="Logging in ";
 GregorianCalendar gc;
 Date dt;
 Thread th;
 Panel chatp;
 TextArea msginta,msgoutta;
 TextField nametf;
 Button clrb,sendb;
 ObjectOutputStream oos;
 ObjectInputStream ois;
 Socket clientchatsock;
 Vector v;
 public void init()
 {
  chatp=new Panel();
  msginta=new TextArea(10,50);
  msginta.setText("Incoming message comes here\nOnly When You Send a Message...!");
  msgoutta=new TextArea(10,25);
  msgoutta.setForeground(Color.blue);
  msgoutta.setBackground(Color.yellow);
  msgoutta.setText("Write your message here.");
  nametf=new TextField(10);
  nametf.setForeground(Color.blue);
  nametf.setText("User name");
  sendb=new Button("Send");
  clrb=new Button("Log out");
  add(chatp);
  chatp.add(nametf);
  chatp.add(msginta);
  chatp.add(msgoutta);
  chatp.add(sendb);
  chatp.add(clrb);
  sendb.addActionListener(this);
  clrb.addActionListener(this);
  th=new Thread(this);
  th.start();
 }
 public void run()
 {
  try
  {
   while(th!=null)
   {
    display();
    th.sleep(1000);
   }
  }
  catch(Exception e)
  {
  }
 }
 public void display()
 {
  dt=new Date();
  gc=new GregorianCalendar();
  gc.setTime(dt);
  int i=gc.get(Calendar.AM_PM);
  if (i==1)
  {
   am_pm="pm";
  }
  else
  {
   am_pm="am";
  }
  int hr=gc.get(Calendar.HOUR);
  if (hr==0)
  {
   hr=12;
  }
  hms=hr+":"+gc.get(Calendar.MINUTE)+":"+gc.get(Calendar.SECOND);
  dmy=gc.get(Calendar.DATE)+"/"+gc.get(Calendar.MONTH)+"/"+gc.get(Calendar.YEAR);
  showStatus("Local time: "+hms+" "+am_pm+"                Date: "+dmy);
 }
 public void actionPerformed(ActionEvent ae)
 {
  if (ae.getSource()==clrb)
  {
   try
   {
    JOptionPane.showMessageDialog(null,"Other logged on users would know if you log out..");
    clientchatsock=new Socket("server ip",1002);
    oos=new ObjectOutputStream(clientchatsock.getOutputStream());
    String logouts=" Logging out "+"<"+nametf.getText()+">";
    oos.writeObject(logouts);
    System.exit(0);
   }
   catch(Exception e)
   {
    JOptionPane.showMessageDialog(null,"Error 1, "+e);
   }
  }
  if (ae.getSource()==sendb)
  {
   try
   {
    clientchatsock=new Socket("server ip",1002);
    oos=new ObjectOutputStream(clientchatsock.getOutputStream());
    String s=tempmsg+"<"+nametf.getText()+"> '"+msgoutta.getText()+"'";
    tempmsg="";
    oos.writeObject(s);
    msgoutta.setText("");
    ois=new ObjectInputStream(clientchatsock.getInputStream());
    v=(Vector)ois.readObject();
    for(int i=0;i2563)
   {
    chatmateserver.allmsgta.setText("");
   }
   chatmateserver.gc=new GregorianCalendar();
         chatmateserver.dt=new Date();
   chatmateserver.gc.setTime(chatmateserver.dt);
   int i = chatmateserver.gc.get(Calendar.AM_PM);
   if (i == 1)
   {
    chatmateserver.am_pm="pm";
   }
   else
   {
    chatmateserver.am_pm="am";
   }
   int hr=chatmateserver.gc.get(Calendar.HOUR);
   if (hr == 0)
   {
    hr=12;
   }
   else
   {
    hr=chatmateserver.gc.get(Calendar.HOUR);
   }
   chatmateserver.allmsgta.append("<"+hr+":"+chatmateserver.gc.get(Calendar.MINUTE)+":"+chatmateserver.gc.get(Calendar.SECOND)+" "+chatmateserver.am_pm+"> "+s+"\n");
   allmsgs=chatmateserver.allmsgta.getText();
   //writing to client
   v.addElement(allmsgs);
   oos=new ObjectOutputStream(clientchatsock.getOutputStream());
   oos.writeObject((Vector)v);
  }
  catch(Exception e)
  {
   JOptionPane.showMessageDialog(null,"Error in connecttoclient constructor, "+e);
  }
 }
};