Thread: multtithreaded chat server

i am not getting desired output ..still there are not errors !!!!

//class MyServer
 
import java.io.*;
import java.net.*;
import java.util.*;
public class MyServer
{
ArrayList al = new ArrayList();
ServerSocket ss;
Socket s;
public MyServer()
{
try{
ss = new ServerSocket(10);
while(true)
{
s = ss.accept();
al.add(s);
Runnable r = new MyThread(s,al);
Thread t = new Thread(r);
t.start();
}
}
catch(Exception e)
{
}
}
public static void main(String...s)
{
new MyServer();
}
}

class MyThread implements Runnable
{
Socket s ;
 
ArrayList al;
MyThread(Socket s,ArrayList al)
{
this.s = s;
this.al = al;
}
public void run()
{
String s1;
try
{
DataInputStream din = new DataInputStream(s.getInputStream());
do{
s1 = din.readUTF();
System.out.println(s1);
if(!s1.equals("stop"))
tellEveryone(s1);
else
{
DataOutputStream dout = new DataOutputStream(s.getOutputStream());
dout.writeUTF(s1);
dout.flush();
}
}
while(!s1.equals("stop"));
}
catch(Exception e)
{}
}
public void tellEveryone(String s1)
{
Iterator i = al.iterator();
while(i.hasNext())
{
try
{Socket sc = (Socket)i.next();
DataOutputStream dout = new DataOutputStream(sc.getOutputStream());
dout.writeUTF(s1);
dout.flush();
System.out.println("client");
}catch(Exception e)
{}
}
}
 
}

//MyClient
 
import java.io.*;
import java.net.*;
import java.util.*;
public class MyClient
{
Socket s;
DataInputStream din;
DataOutputStream dout;
public MyClient()
{
try {
 
s = new Socket("local host",10);
din = new DataInputStream(s.getInputStream());
dout = new DataOutputStream(s.getOutputStream());
clientChat();}
catch (Exception e)
{}
}
public void clientChat() throws IOException 
{
My m = new My(din);
Thread t1 = new Thread(m);
t1.start();
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String s1;
do{
s1 = br.readLine();
 
dout.writeUTF(s1);
dout.flush();
}
while(!s1.equals("stop"));
}
public static void main(String...s)
{
new MyClient();
}
}
class My implements Runnable
{
DataInputStream din;
My(DataInputStream din)
{
this.din = din;
}
public void run()
{
String s2 = " ";
do
{
try {
s2 = din.readUTF();
System.out.println(s2);
}
catch(Exception e)
{}
 
}
 
while(!s2.equals("stop"));
}
}

thanks a lot ......