Re: 5th col dies, cols 6 thru 15 move 1 col left, 15th col is born

Knute Johnson <>
Sat, 20 Apr 2013 09:02:12 -0700
On 4/19/2013 10:29 PM, wrote:

On Friday, April 19, 2013 8:03:06 PM UTC-4, Knute Johnson wrote:
Are these data entry fields? Or just to be displayed? Probably just drawing the
data on a JComponent would be the easiest and quickest but would take a little
more effort to create. JLabels are nice too. -- Knute Johnson

So, you suggest to use a JComponent with (300 x 15) JLabels.

Why would using a JComponent be better than using a JFrame containing JPanels.

With a JComponent, will I be able to easily change the color of the JLabels.

I guess I should use a Layout also.

I was planning to have the columns move left after N seconds.

Are there any other details that I should worry about such as flicker.


No, what I was suggesting was that you draw your data on the JComponent,
or JPanel if you want, rather than use components as it will render much
quicker and you can do a fade in/out or change colors when you move your
data pretty easily. It would be easier to scale as well.

import java.awt.*;
import java.awt.event.*;

public class test extends JComponent implements Runnable {
     private static final String text = "Now is the time for all good
men to " +
      "come to the aid of their country. The quick brown fox jumped
over the " +
      "lazy red dog. Four score and seven years ago our fathers brought
forth" +
      "on this continent a new nation conceived in liberty and dedicated
to " +
      "the proposition that all men are created equal.";
     private final String[][] words = new String[6][6];
     private volatile int n;

     public test() {
         setPreferredSize(new Dimension(400,300));

         String[] array = text.split(" ");
         for (int i=0; i<6; i++)
             for (int j=0; j<6; j++)
                 words[i][j] = array[n++];
         n = 0;

         setFont(new Font("Monospaced",Font.PLAIN,10));

     public void paintComponent(Graphics g) {

         for (int cols=0; cols<6; cols++)
             for (int rows=0; rows<6; rows++)

     public void run() {
         while (true) {
             try {
             } catch (InterruptedException ie) {
             String[] temp = new String[6];
             for (int i=0; i<6; i++)
                 temp[i] = words[2][i];

             for (int i=2; i<5; i++)
                 for (int j=0; j<6; j++)
                     words[i][j] = words[i+1][j];

             for (int i=0; i<6; i++)
                 words[5][i] = temp[i];

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


Knute Johnson

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