Does GregorianCalendar constructor check invalid input?

Question

GregorianCalendar constructor have signature:

GregorianCalendar(int year, int month, int dayOfMonth)
GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute, int second)

What happen if I pass month or dayOfMonth out of constructor contract?

It is easy to check if month in 0-11 range. But it is impossible to check valid day (which should be 28/29/30/31?) without writing own Calendar implementation.

It should be nice if Java Platform checks user date input. I don't like to check if 2015-13-32 is valid ISO date in own code.

Nothing happen, but that doesn't help. Because official docs say nothing on topic I ask question. — gavenkoa, Jan 07 '16 at 18:17

Mateus Viccari · Accepted Answer · 2016-01-07T18:15:08.277

3

The constructor doesn't check, what you can do is to set the time after executing setLenient(false) which will make the Calendar to accept only valid values:

Calendar cal = Calendar.getInstance();
cal.setLenient(false);
cal.set(2016, Calendar.FEBRUARY, 30);
System.out.println(new SimpleDateFormat("dd/MM/yyyy").format(cal.getTime()));

This example will throw an exception because 02/30/2016 is not a valid date (the exception is thrown by cal.getTime()).

edited Jan 07 '16 at 18:15

answered Jan 07 '16 at 18:07

Mateus Viccari

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I expect such answer )) http://stackoverflow.com/questions/226910/how-to-sanity-check-a-date-in-java – gavenkoa Jan 07 '16 at 18:08
To be clear what expression thrown exception? `cal.set()` or `cal.getTime()` or `SimpleDateFormat.format()`? – gavenkoa Jan 07 '16 at 18:10
1

Good point, actually what throws the exception is `cal.getTime()` – Mateus Viccari Jan 07 '16 at 18:14

Does GregorianCalendar constructor check invalid input?

1 Answers1