Unusual sequence behaviour

Question

Hi,
I am having a hard time trying to figure out why I am unable to retrieve the size of a sequence but can still loop through that sequence and print out its contents.
My code is as follows. I have 2 separate class files not included here; the MathQuestion and MathDrill classes. When i call numbers.size() in the for loop, it always comes back as zero, but when i hard code the upper range, i am able to print the numbers onto my panel. Can someone please tell me what I am doing wrong?
Thanks.
Johnny
package MathDrillApplication;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import javafx.scene.layout.Panel;
import javafx.scene.input.KeyEvent;
import javafx.scene.shape.Line;
import javafx.scene.paint.Color;
import java.util.Iterator;
* @author Johnny
var yAxis:Number;
var countPerQuestion;
var numbers:Integer[];
var it:Iterator;
var drills:MathDrills;
var panel = Panel {
content: [
for (i in [0..< numbers.size()]){
Text {
     font: Font {
          size: 24
     x: 100, y: yAxis+=20
     content: bind if (numbers.get(i).toString().length()<2){" {numbers.get(i).toString()}"} else{numbers.get(i).toString()}
Line {
     startX: 100, startY: yAxis+10
     endX: 120, endY: yAxis +10
     strokeWidth: 1
     stroke: Color.BLACK
onKeyTyped:function(e: KeyEvent): Void {
     //operands = "Hello World"
yAxis = 100;
if (it.hasNext()){
var question:MathQuestion = it.next() as MathQuestion;
numbers = question.numbers;
println("aft numbers size:{numbers.size()}");
Stage {
title: "Application title"
scene: Scene {
width: 480
height: 300
content: [panel]
panel.requestFocus();
drills = MathDrills{countPerQuestion:2; numOfQuestions:10; maxNum:100;};
var questions = drills.drillSet;
it = questions.iterator();

Answer 1

Hi PhiLho,
Thanks for the reply. I have changed my code a bit after following the advice but my "for" loop is still coming up with no numbers even though my println statement has a size greater than 1. My revised code is as follows. Sorry if this looks very simple but I am very new to JavaFx and am carrying habits over from Java.
package MathDrillApplication;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import javafx.scene.layout.Panel;
import javafx.scene.input.KeyEvent;
import javafx.scene.shape.Line;
import javafx.scene.paint.Color;
import java.util.Iterator;
* @author Johnny
var yAxis:Number;
var numbers:Integer[];
var it:Iterator;
var drills:MathDrills;
var panel = Panel {
content: [
for (num in numbers){
Text {
     font: Font {
          size: 24
     x: 100, y: yAxis+=20
     content: bind if (num.toString().length()<2){" {num.toString()}"} else{num.toString()}
Line {
     startX: 100, startY: yAxis+10
     endX: 120, endY: yAxis +10
     strokeWidth: 1
     stroke: Color.BLACK
onKeyTyped:function(e: KeyEvent): Void {
     //operands = "Hello World"
yAxis = 100;
if (it.hasNext()){
var question:MathQuestion = it.next() as MathQuestion;
numbers = question.numbers;
println("aft numbers size:{sizeof numbers}");
Stage {
title: "Application title"
scene: Scene {
width: 480
height: 300
content: [panel]
panel.requestFocus();
drills = MathDrills{countPerQuestion:2; numOfQuestions:10; maxNum:100;};
var questions = drills.drillSet;
it = questions.iterator();
Edited by: user10504967 on 11/11/2010 21:32
Edited by: user10504967 on 11/11/2010 22:21