Re: Coordinating multiple JTextField updates across panels

Knute Johnson <>
Mon, 15 Jun 2009 17:17:26 -0700
John B. Matthews wrote:

In article
 "Jarrick Chagma" <> wrote:


Do you realise that there are many, many panels and that
this is the cause of the problem?

How many is "many, many"? I see apparently simultaneous updates with 256
separate JPanels. I really don't think that's the problem. Perhaps you
could supply a short example: <>.

Here's an SSCCE with a thousand JTextFields being updated. I see his
problem on my computer. A really fast computer might not.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JFrame implements Runnable {
     JTextField[] fields = new JTextField[1000];
     int n;

     public test() {
         setLayout(new GridLayout(25,40));

         for (int i=0; i<fields.length; i++) {
             fields[i] = new JTextField("000");


     public void run() {
         while (true) {
             for (int i=0; i<fields.length; i++)
             try {
             } catch (InterruptedException ie) {

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 test t = new test();
                 new Thread(t).start();


Knute Johnson
email s/nospam/knute2009/

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