Re: Coordinating multiple JTextField updates across panels

Lew <>
Tue, 16 Jun 2009 08:42:43 -0400
Knute Johnson wrote:

This is slapped together and could have some threading issues

I'm pretty sure you need to make 'bi' volatile for the memory model.

but it works to demonstrate the point.

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

public class test extends JPanel implements Runnable {

class Test

    JTextField[] fields = new JTextField[1200];
    int n;
    Robot robot;
    BufferedImage bi;
    MyGlassPane mgp;

    public test() throws AWTException {
        setLayout(new GridLayout(30,40));

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

        robot = new Robot();
        mgp = new MyGlassPane();

    public void run() {
        while (true) {
            Point p = getLocationOnScreen();
            Rectangle r = new Rectangle(p.x,p.y,getWidth(),getHeight());
            bi = robot.createScreenCapture(r);

            for (int i=0; i<fields.length; i++)


            try {
            } catch (InterruptedException ie) {

    class MyGlassPane extends JComponent {
        public void paintComponent(Graphics g) {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    JFrame f = new JFrame();
                    test t = new test();
                    new Thread(t).start();
                } catch (AWTException awte) {


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