Re: Issue with array length in for loop

I have a web application where I am extracting horse race information
from the internet. I have 3 main objects: "horse" which stores the
name and odds of the horse; "race" which has an array of horse objects
which are in the race; and "track" which has an array of race objects
which are run on the same day.

The part of the application which extracts the data from the internet
is working fine.

I am then trying to loop through each race on the track to determine
the most likely horse to win, but am having problems with the loop.
The array of races in the track seems to have length zero for a good
portion of the loop, then slowly increases to the correct length

My debugging code is basically

Track t = new Track(); //This initialises the race and horse arrays
for (Race r : track.getRaces()){
     System.out.println("for race" + r.getRaceNumber() + " there is " +
r.getHorse().length + " horses");
}

The output is something like:
for race 1 there is 0 horses
for race 1 there is 0 horses
for race 1 there is 0 horses
for race 1 there is 0 horses
for race 1 there is 1 horses
for race 1 there is 1 horses
for race 1 there is 2 horses
for race 1 there is 2 horses
for race 1 there is 3 horses
...
for race 2 there is 0 horses
for race 2 there is 0 horses
...
...
for race 8 there is 15 horses

In my mind, this should just loop through the number of races and
display the number of horses in each race, but there is something
funny going on with the loop where the length of the horse array in
the race is zero for a lot of the loop, then starts to fill out, but
still the loop goes over the same race repeatedly before getting to
the end.

I have written this same application successfully in R and Objective-
C, but am stumped with this Java problem. Any thoughts as to the
source of the problem?