2012-05-01 in ISO and 2012-05-01 in Coptic/Ethiopic/Hijra etc are
totally different dates on the time-line. You're only considering it
to be a problem because for GJ after the cutover date they happen to
represent the same date on the time-line.
Its a design flaw, because pluggable chronologies don't work for most
people as they don't realise the chronology field exists and is used
in most cases. The problem is made worse because the toString doesn't
show it. But there is zero chance of fixing it. Its not a bug, because
it works as originally intended and designed, its just that the design
is imperfect (and backwards compatibiilty prevents change).
ThreeTen/JSR-310 will have a different design approach, because of this issue.
The short answer is that you must control the chronology of the
dates/times you use.
Stephen
On 28 June 2012 01:51, John Hanks <jhanks9...@gmail.com> wrote:
> I agree that comparing chronology in the equals() method for the LocalDate
> class is a design flaw (bug).
>
> Are there any plans on fixing it?
>
> I can see some pretty nasty bugs from this such as using LocalDate instances
> as keys in a Map. You might not get what you expect.
>
> On Wed, Jun 27, 2012 at 2:15 AM, Stephen Colebourne <scolebou...@joda.org>
> wrote:
>>
>> Print out the result of getChronology() for both, and see if they are
>> equal. I suspect they are different (equals depends on the chronology
>> - a design flaw in Joda-Time).
>> Stephen
>>
>>
>>
>> On 27 June 2012 02:51, John Hanks <jhanks9...@gmail.com> wrote:
>> > I was surprised when I was using the equals() method of the LocalDate
>> > class.
>> >
>> > It was not behaving as I would expect.
>> >
>> > Take a look at the code below:
>> >
>> > DateTimeFormatter dateTimeFormat =
>> > DateTimeFormat.forPattern("yyyyMMdd
>> > HH:mm");
>> > Calendar calendar = dateTimeFormat.parseDateTime("20120621
>> > 09:00").toCalendar(null);
>> > LocalDate localDate1 = new LocalDate(calendar);
>> > LocalDate localDate2 = new LocalDate(2012,6,21);
>> > System.out.println(localDate1);
>> > System.out.println(localDate2);
>> > System.out.println("equals(): " + localDate1.equals(localDate2));
>> > System.out.println("isEqual(): " +
>> > localDate1.isEqual(localDate2));
>> >
>> >
>> > The output is:
>> >
>> > 2012-06-21
>> > 2012-06-21
>> > equals(): false
>> > isEqual(): true
>> >
>> >
>> > Why is the equals method comparison false.
>> >
>> > Is this not a Joda bug?
>> >
>> > P.S. I'm using Joda 2.1
>> >
>> >
>> >
>> >
>> >
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