Home/ Questions/Q 9005267
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-16T01:05:54+00:00

I have two basic questions. I have a GUI project with Java Swing. When

  • 0

I have two basic questions.

  • I have a GUI project with Java Swing. When I put buttons on the frame and I double clicked them, I had the code of the actionPerformed, but it is blocked.

    How can I put there a button and then use it on a actionListener?

  • My Project is about Server-client (multithread and sockets)

    I call one method to reiceve one string that we can write on a JtextField and it stays on a while cicle with PrintWriter and a getOutputStream.

    Something like:

do{
...
}while(thisstring!=null || thisstring!="exit")

So.. when I write something and press the button to send it, it stays on the cicle and the button blocks. How can I unblock the button to write something else?

Edit:
I understood the EDT problem, but I can’t solve it.

I tried use the Timer but without success, something like that:

  int delay = 1000; //milliseconds
  ActionListener listener = new ActionListener() {
  public void actionPerformed(ActionEvent e) {
  //My action calling the Thread class with the while cicle that has the PrintWriter
       }

  };
new Timer(delay, listener).start();

How can I handle this to do the timer when I press the button?

How can I stay on the that cicle (read the comment line) to send the information by OutputStream every time that one user enter something on the text field?
I know that for example for a console application I use a BufferedReader and then I use the ReadLine() to wait for anything sent from the console, but with GUI interface it freezes all time..

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    There is a fundamental concept in Java GUI development surrounding which thread in which the developer implements user-interaction processing such as button clicks.

    In short, you need to perform your processing outside of the thread that calls your action handling method. This single thread is known as the Event Dispatch Thread (EDT), and if you have logic that runs much more than a few milliseconds, it will prevent the UI from continuing to draw things like the button releasing, etc.

    You’ll want to move your long-running, socket code off the EDT. Doing so will allow the button to release and let the user interact with other controls (or even the same button).

    To avoid duplicating other discussions on the topic, I direct you to this pretty good one. Additionally, this article gives a short overview of threading concepts in Swing.

    Regards,

    ScottH

    • 0