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According to the Java API, the constructor Date(year, month, day) is deprecated. I know that I can replace it with the following code:

Calendar myCal = Calendar.getInstance();
myCal.set(Calendar.YEAR, theYear);
myCal.set(Calendar.MONTH, theMonth);
myCal.set(Calendar.DAY_OF_MONTH, theDay);
Date theDate = myCal.getTime();

However, I would like something shorter to replace it with (ideally one to two lines).

You could use new GregorianCalendar(theYear, theMonth, theDay).getTime():

public GregorianCalendar(int year, int month, int dayOfMonth)

Constructs a GregorianCalendar with the given date set in the default time zone with the default locale.

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You could use

new SimpleDateFormat( "yyyyMMdd" ).parse( "20100520" )

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This is yet another reason to use Joda Time

new DateMidnight(2010, 3, 5)

DateMidnight is now deprecated but the same effect can be achieved with Joda Time DateTime

DateTime dt = new DateTime(2010, 3, 5, 0, 0);

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Calendar has a set() method that can set the year, month, and day-of-month in one call:

myCal.set( theYear, theMonth, theDay );

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Why don't you just write a simple utility method:

public final class DateUtils {
    private DateUtils() {
    }

    public static Calendar calendarFor(int year, int month, int day) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month);
        cal.set(Calendar.DAY_OF_MONTH, day);
        return cal;
    }

    // ... maybe other utility methods
}

And then call that everywhere in the rest of your code:

Calendar cal = DateUtils.calendarFor(2010, Calendar.MAY, 21);

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Comments
  • FYI: The terrible Calendar class is now supplanted by the modern java.time classes defined in JSR 310. For a date-only value, without time-of-day and without time zone, use LocalDate class.
  • I believe this is the "official Java correct answer" of how you are supposed to do it. Personally I rately have year, month and day in three fields like that, I usually have some form of string, so I use SimpleDateFormat.
  • Remember that January is 0, not 1. Or use Calendar constants: Calendar.JANUARY, etc.
  • @AlexanderPogrebnyak good tip. It really is some really sadistic stuff from Java. "Let's see, years, yep, they'll be base 1, days base 1.. but months.. mwhahaha! base ZERO!" How much time has been wasted finding this sort of bug in your code ?
  • @angryITguy Approx 5 mins. That is infact if you created a unit test
  • @Nanotron unit tests.. lol
  • But he has theYear, theMonth, theDay. Do you suggest he converts those to strings, and then concatenates them?
  • It should be mentioned that SimpleDateFormat isn't thread safe
  • @stacker Are you sure? I thought it was only shared instances of SimpleDateFormat - not the class itself. You're saying the class has static state?
  • To the best of my knowledge, SimpleDateFormat is not thread safe in that you cannot create a single instance, use it from two different threads that may execute simultaneously, and be confident that it will work. But I don't think there's any risk in creating an instance within a function and using it, as that instance would then only be used by the one thread. If I'm missing something here, feel free to correct me, but I've never observed a problem with such usage.