I need help with socket connection pooling please

Question

I need a basic connection pooling system for the code below users sets number connections 5 etc.
<main class>
s = new ListService(ssock.accept(),serverDir); //give list to client
Thread t = new Thread(s);
t.start();
<main class>
class ListService implements Runnable
Socket client;
String serverDir;
public ListService(Socket client,String serverDir)
this.client = client;
this.serverDir = serverDir;
public void run()
try
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
// send something to client
catch(Exception e)
System.out.println(e);
System.out.println("client disconnected\n");
catch(Exception e){}
Thank you so much

Answer 1

My code already accepts multi clients I need pooling only 5 clients can be using the server at a time when one client disconnects that means another incoming client can enter the pool to use the server.
I tried to do a counter so when a connection is made it increments and then if counter>=numOfClients
set a variable to true or false and this is sent with the server setup so it determines if the server code is run or it just closes the connection but there is no way I can access the counter variable from within a runnable class thread when a client closes connection it should -1 from the variable
thanks