On Thursday, November 08, 2012 01:35:55 PM Lyallex wrote:
> I have tried everything I can think of to reproduce this behaviour
> in a standalone Java program but the list is always returned
> as required. When I call the method from a servlet the list is always
> returned
> in it's natural order, I know collections.sort is being executed as
> the list is in alpha order, it's almost as if the comparator is being
> replaced in some way
>
> I have no servlet filters or any other code 'in the way' between the facade
> and the initialization servlet.
>
> Any ideas ?
I'm not sure that you can ever get consistent results if the input order is
random. The Collections.sort() implements a merge sort and the merge sort
depends on a consistent result from the compare() method. As implemented the
compare() will return what you want when the object being compared against is
the "Misc" object but return a string compare when it isn't. Try this:
@Override
public int compareTo(Category c) {
if(category.equals("Miscellaneous")){
return 1;
} elseif (c.category.equals("Miscellaneous")) {
return -1;
else{
return category.compareTo(c.category);
}
}
(side comment: If the list is a decent size it might make sense to compare
against the Misc object rather than compare all strings but it's likely not
worth the bother).
The was I usually handle this is to .remove the offending object from the list,
sort, then .add it back on after the sort. Keep the odd code local to the
oddity.
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