How to read from GUI input?

Hi guys, I hope this one will be easy for you

I have a client connected to a server. How can I loop the client to wait until a user presses a Jbutton?
For example:
server waits for input=>client clicks a button => sends data to server =>server replies =>client receives data and does something=>client continues to wait for a button click=>server waits for input

I know if I use

Code :

---

BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in) 
message = stdin.readLine()

---

;
will wait for keyboard input. What do i do for a button input?
Thank You

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i doubt anyone will reply so just delete it