Changing button label

Question

this is my program. i have created a grid of 20 * 20 and randomly assigned integers 0 to 4 into the cells (and colors corresponding to them).
Now i need to put this program into a loop...i.e. the labels of the button should change with every loop....such that we can watch each transition for 5 seconds (hence there has to be some kind of pause, and some kind of dissolve older applet function). I should be able to change the button label by specifying the particular button (lets say [3][4]), finding the current value/label of the button, and then assigning a new label of the button.
Can somebody help.
import java.awt.*;
import java.lang.*;
import java.applet.*;
import java.util.Random;
<applet code="GridDemo" width=600 height=600>
</applet>
public class GridDemo extends Applet{
static final int n = 20;
static final int t = 10;
Random r = new Random();
public void init(){
setLayout(new GridLayout(n,n));
Color[] cols = {Color.WHITE, Color.YELLOW, Color.CYAN, Color.BLUE, Color.RED};
for(int i=0; i<n; i++){
for(int j=0;j<n; j++) {
Button[][] myArray = new Button[n][n];
int k=r.nextInt(5);
Button b = new Button("" +k);
b.setBackground(cols[k]);
myArray[j] = b;
add(b);

Answer 1

I'm not sure if this is really what you want, make your class run a thread, that changes your labels after 5 second pauses. public class GridDemo extends Applet implements Runnable {
public void init() {
   new Thread(this).start();  // starts the thread running.
public void run() {
  while (someCondition) {
    // your for loops here..
    Thread.sleep(5000); // pause 5 seconds before running for loops again
}