Version 8 (LTS) -2014-03

• 🔗 Java 8 Documentation
• 🔗 Java 8 Javadoc

Usage from sdkman

• sdk install java 8.0.302-open - install
• sdk use java 8.0.302-open - use in current shell

Compact Profiles [JEP 161]

• EJDK - Embedded JDK
  • 🔗 Introducing the EJDK
  • 🔗 Exploring jrecreate
  • jrecreate - can create different JVM profiles.
• javac -profile <profile> - compiles for a specific profile.

Lambda Expressions and the stream API [JEP 126]

• Lambda Details

Date & Time API - 🔗 java.time [JEP 150]

Described in [Java SE 8 for the really impatient] chapter 5.

All objects are immutable.

A few notes on date and datetime used in programming is found in Usage of Dates and Times in Networked Applications

• Instant - a point in time.
• Duration - a time based amount of time. The difference between two Instant’s. See DurationTest for an example of measuring the duration of an operation.
• Period - a date based amount of time. Use this when working with calendar days.
• Types without time zone:
  • LocalDate - a date without a time. This stores a date like ‘2010-12-03’ and could be used to store a birthday.

    LocalDate today = LocalDate.now();
    LocalDate someday = LocalDate.of(1969, Month.JULY, 16);
    

  • LocalTime - a time without a date. This stores a time like ‘11:30’ and could be used to store an opening or closing time.
  • LocalDateTime - stores a date and time. This stores a date-time like ‘2010-12-03T11:30’.
• ZonedDateTime - date time with time zones. Use this if you need to account for daylight changes.
• java.time.temporal.TemporalAdjusters - static methods for returning different adjusters of dates. E.g. next(TUESDAY) or lastDayOfMonth. See examples in TemporalTest.
• java.time.format.DateTimeFormatter - static formatters for formatting date and time. E.g. ISO_LOCAL_DATE. Specific instances can be created by using DateTimeFormatter.ofPattern("yyyy-MM-dd"). All DateTime objects has a format() and a parse() method that takes a DateTimeFormatter as argument.
• java.time.chrono-package - calendar systems for other systems than the Gregorian calendar. Supported systems:
  • Hijrah calendar - the Islamic calendar
  • Japanese calendar
  • Minguo calendar - the calendar in Taiwan
  • Thai Buddhist calendar - the calendar in Thailand

  See ChronologyTest for an example of the current date in these calendars.

java.util.Base64 encoder and decoder

Base64 encoders and decoders for:

• basic format (RFC 2045)
• URL encoding (RFC 4648)
• MIME encoding (line break every 76’th character)

See examples in Base64Test.

JNI - Statically linked libraries [JEP 178]

• TODO

Project Nashorn - javascript runtime [JEP 174]

• replaces Rhino
• 🔗 javax.script
• 🔗 jrunscript - command line script shell that supports multiple scripting languages
  • jrunscript -q - lists the supported script engines
  • supports both REPL mode and running of script files
• deprecated in java 11

Garbage Collectors

• removal of the Permanent Generation [JEP 122]

HotSpot Virtual Machine Garbage Collection Tuning Guide, release 8 (🔗 original link)