Doubt on Multithreading socket server

Question

Iam implemented a multi threaded socket server,My server is going to get the data from the client thro BufferedInputStream and then send back the same data to the originated client.If single client is running means no problem but if more than a client get connected with the server means data frm the client1 is sended to the client2 while client2 data comes to the client1.Iam using buffered output stream for writing data to the client.Iam declared both bufferedoutput and bufferedinput streams as public......... can anyone give the solution for the problem...its very urgen.... can any one do.......

Answer 1

class ServerSocketDemo
Lock lo=new ReentrantLock();
Condition con=lo.newCondition();
ServerSocket s;
Socket socket;
void runServer()
new Thread(new timeStampDemo(lo)).start();
s=new ServerSocket(9098);
for(;;)
new Thread(new ThreadParent(s.accept(),lo,con)).start();
class ThreadParent
Thread[] t;
Lock lo;
Condition con;
ThreadParent(Socket soc,Lock l,Condition c)
InputStream,OutputStream are created here using socket....
lo=l;
con=c;
public void run()
for(int i=0;i<2;i++)
t=new Thread(new ServerThread(OutputStream,lo,con));
t[i[.start();
for(;;)
using InputStream read the data....
then acquire the lock and then adding the data to linkedlist...
after adding the data it wil signal to serverthread....
class ServerThread implements Runnable
ServerThread(OutputStream,Lock l,Condition c)
assign all those to corresponding variables....
public void run()
for(;;)
when ever the parent thread signals
check the linkedlist...
if the length of the linked list greater than one means retrive the data and using that OutputStream send to corresponding user....
else it waits on condition variable
class timeStampDemo
timeStampDemo(Lock l)
assign this lock to corresponding variable...
public void run()
for(;;){
The lock variable should be used at certain stage for some period during that time all the process in the server should waits... after the ending of process it releases the lock then the server continues the function..........
The problem is iam using lock as globally... By implementing the server in that way means i got the same problem... for multiple client,one client data send to another client and vice versa.....if i am using the lock globally in the Parent thread then i wil pass to the Server Thread means it works normally.... But my specification is to compulsorly use the lock before accepting the connection..........