Java 8 date & time javaday2014
2 likes1,317 views
This document discusses the new Java 8 Date & Time API (JSR-310), which replaces the old date and time classes. The new API includes classes like LocalDate, LocalTime, LocalDateTime, and ZonedDateTime that provide a more fluent and immutable way to work with dates and times. It also separates different concepts like dates, times, time zones, and periods/durations into distinct types with clear purposes. The new API is based on abstractions like Temporal, TemporalAdjuster, TemporalField, and TemporalUnit that make it flexible for manipulating date and time values.
Java 8 date & time javaday2014
- 1. Java 8 Date & Time API Speaker: Oleg Tsal-‐Tsalko(@tsaltsol)
- 2. About me Oleg Tsal-‐Tsalko Lead So:ware Engineer at EPAM Systems. Speaker, acEve member of Kiev JUG. ParEcipate in different educaEonal iniEaEves and JCP/AdoptJSR programs.
- 3. Benefits • JSR-‐310: New Date & Time API • Replaces old ambiguous java.uEl.Date, Calendar, TimeZone, DateFormat classes • More fluent/simple/clean API • Immutable classes • Using Java8 features including lambdas • Precise separaEon of concepts
- 4. Range of types • LocalDate – a date only • LocalTime – a Eme only • LocalDateTime – date with Eme • ZonedDateTime – date with Eme in Eme zone • Period -‐ date-‐based amount of Eme • Dura>on -‐ Eme-‐based amount of Eme • And more…
- 5. TimeZones If you can avoid using TimeZones – do it! If not – use ZonedDateAndTime!
- 6. TimeZone classes in Java 8 • ZoneId – replacement for TimeZone class (e.g. “Europe/London”, “Europe/Kiev”) • ZoneOffset – represenEng offset from UTC Eme • ZoneRules – behind the scenes class which defines Eme zone rules • ZonedDateTime – main date/Eme class which is aware of Eme zones
- 7. Power of abstracEon New API is very flexible because it based on number of abstracEons at it’s boeom: • Temporal – parent class for all date/Eme objects which defines mutaEon operaEon for them such as plus/ minus/with • TemporalAdjuster – funcEonal interface which responsible for mutaEng Temporal objects • TemporalField – represents parts/fields of date/Eme objects such as (DAY_OF_WEEK, MONTH, etc.) • TemporalUnit – represents type of date/Eme values such as (MINUTES, DAYS, YEARS, etc.) • TemporalAmount – class which represents amount of Eme
- 9. Links • heps://today.java.net/pub/a/today/2008/09/18/ jsr-‐310-‐new-‐java-‐date-‐Eme-‐api.html • hep://blog.joda.org/2009/11/why-‐jsr-‐310-‐isn-‐ joda-‐Eme_4941.html • heps://blogs.oracle.com/thejavatutorials/entry/ javaone_2013_jdk_8_date • hep://vimeo.com/87157763 • hep://parleys.com/play/ 52508380e4b0c4f11ec57665/about • hep://www.oracle.com/events/us/en/java8/ index.html
- 10. Thank you! Oleg Tsal-‐Tsalko Email: oleg.tsalko@gmail.com Twieer: @tsaltsol