Set Date in a single line

Question

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

User · Accepted Answer

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

User · Answer

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

User · Answer

tl dr  LocalDate of  2015   Month JUNE   7       Using handy  Month  enum        or     LocalDate of  2015   6   7       Sensible numbering  1-12 for January to December     java time  The java time framework built into Java 8 and later supplants the troublesome old classes  java util Date  Calendar   The java time classes use immutable objects  So they are inherently thread-safe  You will have none of the thread-safety problems mentioned on the other answers   LocalDate  This framework included a class for date-only objects without any time-of-day or time zone  LocalDate  Note that a time zone  ZoneId  is necessary to determine a date    LocalDate today   LocalDate now  ZoneId of   America Montreal         You can instantiate for a specific date  Note that month number is a sensible range of 1-12 unlike the old classes    LocalDate localDate   LocalDate of  2015   6   7      Or use the enum  Month   LocalDate localDate   LocalDate of  2015   Month JUNE   7      Convert  Best to avoid the old date-time classes  But if you must  you can convert  Call new methods added to the old classes to facilitate conversions   In this case we need to specify a time-of-day to go along with our date-only value  to be combined for a java util Date object  First moment of the day likely makes sense  Let java time determine the time of that first moment as it is not always 00 00 00 0   We also need to specify a time zone  as the date varies by time zone   ZoneId zoneId   zoneId of   America Montreal     ZonedDateTime zdt   localDate atStartOfDay  zoneId      An Instant is a basic class in java time  representing a moment on the timeline in UTC  Feed an Instant to static method on Date to convert   Instant instant   zdt toInstant    java util Date utilDate   java util Date from  instant        About java time  The java time framework is built into Java 8 and later  These classes supplant the troublesome old legacy date-time classes such as java util Date  Calendar   amp  SimpleDateFormat   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   You may exchange java time objects directly with your database  Use a JDBC driver compliant with JDBC 4 2 or later  No need for strings  no need for java sql   classes   Where to obtain the java time classes     Java SE 8  Java SE 9  Java SE 10  Java SE 11  and later  - Part of the standard Java API with a bundled implementation    Java 9 adds some minor features and fixes   Java SE 6 and Java SE 7   Most of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android   lt 26   the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   See How to use ThreeTenABP        The ThreeTen-Extra project extends java time with additional classes  This project is a proving ground for possible future additions to java time  You may find some useful classes here such as Interval  YearWeek  YearQuarter  and more

User · Answer

Date date   new DateTime 2014  6  20  0  0  toDate      DateTime is from Joda org  https   www joda org joda-time apidocs org joda time DateTime html

User · Answer

You could use  new SimpleDateFormat   yyyyMMdd    parse   20100520

User · Answer

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

User · Answer

Calendar has a set   method that can set the year  month  and day-of-month in one call   myCal set  theYear  theMonth  theDay

User · Answer

Use the constructor Date year month date  in Java 8 it is deprecated   Date date   new Date 1990  10  26  0  0     The best way is to use SimpleDateFormat  DateFormat format   new SimpleDateFormat  dd MM yyyy    Date date   format parse  26 10 1985      you need to import import java text SimpleDateFormat

[java] Set Date in a single line

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