Александр Белокрылов. java 8: create the future

Java 8: Create The Future

Александр Белокрылов

@gigabel


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Java 8


Java 8

Лямбда выражения

Групповые операции

Nashorn – движок Javascript

Аннотации типов

Новый API даты и времени

Сompact profiles

New UI controls, Modena, 3D – Java FX

http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html


Java 8


Групповые операции

Аннотации типов


Сompact profiles

New UI controls, Modena, 3D – Java FX

http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html


Type annotations


Анотации в Java

@Stateless @LocalBean public class GalleryFacade {

@EJB private GalleryEAO galleryEAO;

@TransactionAttribute(SUPPORTS)

public Gallery findById(Long id) { ... }

@TransactionAttribute(REQUIRED)

public void create(String name) { … }


Аннотации в Java

Появились в Java 5

Built-in

@Override

@Deprecated

@SupressWarning

Custom

Широко используются

JavaEE

Test harnesses

@


Аннотации в Java 7 и раньше

Declarations only

– Class

– Method

– Field

– Parameter

– Variable

@A public class Test {

@B private int a = 0;

@C public void m(@D Object o) {

@E int a = 1;

...

}

}


Custom annotations

Определить

Использовать в коде

Использовать в runtime

– Reflection

Использовать в compile-time

– Annotation processor


Аннотации в Java 8

Типы могут быть проаннотированы

повторяющиеся аннотации

@


JSR 308: Annotations on Java Types (1)

method receivers

public int size() @Readonly { ... }

generic type arguments

Map<@NonNull String, @NonEmpty List<@Readonly Document>> files;

arrays

Document[][@Readonly] docs2 = new Document[2] [@Readonly 12];



typecasts

myString = (@NonNull String)myObject;

type tests

boolean isNonNull = myString instanceof @NonNull String;

object creation

new @NonEmpty @Readonly List(myNonEmptyStringSet)



type parameter bounds

<T extends @A Object, U extends @C Cloneable>

class inheritance

– class UnmodifiableList implements @Readonly List<@Readonly T> { ... }

throws clauses

– void monitorTemperature() throws @Critical TemperatureException { ... }


Аннотации в Java 8

Используются в типах

Анализ во время компиляции

И что?

Огромная работа по верификации во время компиляции


JSR 305: Annotations for Software Defect Detection

Nullness

Check return value

Taint

Concurrency

Internationalization


Checkers framework. Type checkers.

Nullness

IGJ (Immutability Generics Java)

Lock

Property file

Units

Typestate

@

http://types.cs.washington.edu/checker-framework/


IGJ (Immutability Generics Java) checkers

@Immutable

@Mutable

@ReadOnly

@Assignable

@AssignFields

javac -processor org.checkerframework.checker.igj.IGJChecker IGJExample.java


LocalDate

Год-Месяц-День (2014-04-16)

Хранит даты: День рождения, начальная/конечная дата, праздник


LocalDate Пример

LocalDate current = LocalDate.now();

LocalDate programmerDay = LocalDate.of(2014,

Month.SEPTEMBER, 13);

if (current.isEqual(programmerDay))

System.out.println("Congratulate friends");

String str = current.toString(); // 2014.05.17

boolean leap = current.isLeapYear(); // false

int daysInMonth = current.lengthOfMonth(); // 30


LocalDate

Методы для увеличения, уменьшения и установки даты

Immutable

Изменяем дату


LocalDate Изменяем дату

LocalDate date = LocalDate.now();

date = date.plusMonths(2).minusDays(15);

date = date.withDayOfMonth(9);

date = date.with(Month.MAY);


LocalDate Изменяем дату по-человечески

date = date.with(TemporalAdjuster.firstDayOfNextMonth());

date = date.with(firstDayOfNextMonth());

date = date.with(next(DayOfWeek.MONDAY));


LocalTime Пример

LocalTime current = LocalTime.now();

LocalTime time = LocalTime.of(12, 35);

String str = time.toString(); //12:35

time = time.plusHours(1).minusMinutes(45).withSecond(30);

// 12:35:30

time = time.truncatedTo(ChronoUnit.MINUTES); // 12:50


LocalDateTime Пример

LocalDateTime current = LocalDateTime.now();

LocalDateTime arrival =

LocalDateTime.of(2014, Month.MAY, 16, 21, 00);

LocalDateTime departure =

arrival.plusDays(1).plusHours(21).minusMinutes(35);

String str = departure.toString(); //2014-05-18T17:25


Instant миллисекунды с 01.01.1970

Instant timeStamp1 = Instant.now();

Instant timeStamp2 = Instant.now();

if (timeStamp1.isAfter(timeStamp2)) ... ;

Instant timeStamp3 = timeStamp2.plusSeconds(10);

эквивалент java.util.Date

24 октября 2014 года, 09:03:34 UTC, EPOCH = 14 14 14 14 14


Часовые пояса

Часовые пояса определяются политическими мотивами

Правила часовых поясов меняются

http://www.iana.org/time-zones

TimeZones


ZonedDateTime аналог java.util.GregorianCalendar

ZoneId moscow = ZoneId.of("Europe/Moscow");

ZoneId berlin = ZoneId.of("Europe/Berlin");

LocalDateTime dateTime =

LocalDateTime.of(2014, Month.MAY, 30, 7, 30);

ZonedDateTime moscowDateTime =

ZonedDateTime.of(dateTime, moscow);

//2014-05-04T07:30+04:00[Europe/Moscow]

ZonedDateTime berlinTime =

moscowDateTime.withZoneSameInstant(berlin);

//2014-05-04T05:30+02:00[Europe/Berlin]


Интервалы Время

Duration myTalkDuration = Duration.ofMinutes(45);

myTalkDuration = myTalkDuration.plusMinutes(5);

startTalk = LocalDateTime.of(2014, Month.May, 17, 11, 00);

endTalk = startTalk.plus(myTalkDuration);


Интервалы Дата

startArmy = LocalDate.of(2014, Month.May, 30);

Period armyPeriod = Period.ofYears(1);

endArmy = startArmy.plus(armyPeriod);

currentDate = LocalDate.of(2014, Month.NOVEMBER, 29);

Period tillDembel = Period.between(currentDate, endArmy);


Пользуйтесь на здоровье! New Date & Time API Java 8

LocalDate 2014-04-16

LocalTime 12:35:30

LocalDateTime 2014-04-16T22:55

ZonedDateTime 2014-05-04T07:30+04:00[Europe/Moscow]

Instant 1397216152942

Duration PT1H10M

Period P4M6D


for (Orange o: orangebox) {

if (o.getColor() == GREEN)

o.setColor(ORANGE);

}

http://www.californiaoranges.com/40lb-box-bushel-organic-valencia-oranges.html

Common case


orangebox.forEach( o → {

if (o.getColor() == GREEN)

o.setColor(ORANGE);

})

http://www.californiaoranges.com/40lb-box-bushel-organic-valencia-oranges.html

Common case with Lambdas


Collection.forEach()


interface Collection<T> {

...

default void forEach(Block<T> action) {

for (T t: this)

action.apply(t);

}

}

Default methods


Маленький шаг для языка – гигантский скачок для библиотек


Stream API


Mary had a little lambda

Whose fleece was white and snow

And everywhere that Mary went

Lambda was sure to go!

Mary had a little Lambda

https://github.com/steveonjava/MaryHadALittleLambda


Iterating with Lambdas


Итерации с Лямбдами

Group cells = new Group(IntStream

.range(0, HORIZONTAL_CELLS)

.mapToObj(i-> IntStream

.range(0, VERTICAL_CELLS)

.mapToObj(j -> {

// Logic goes here

return rect;}))

.flatMap(s -> s)

.toArray(Rectangle[]::new));

Stream generation


Iterating with Lambdas

Stream.iterate(tail, lamb -> new SpriteView.Lamb(lamb))

.skip(1).limit(7)

.forEach(s.getAnimals()::add);

Stream iterate()


•Стрим из коллекции Collection.stream();

•Стрим объектов Stream.of(bananas, oranges, apples);

•Числовой дипапзон IntStream.range(0, 100);

•Итеративность Stream.iterate(tail, lamb -> new Lamb(lamb));



Фильтруем Стрим с Лямбдами



public void visit(Shepherd s) {

s.getAnimals().stream().filter(a -> a.getNumber() % 4 == 1)

.forEach(a -> a.setColor(null));


.forEach(a -> a.setColor(Color.YELLOW));


.forEach(a -> a.setColor(Color.CYAN));


.forEach(a -> a.setColor(Color.GREEN));

}



public static Predicate<SpriteView> checkIfLambIs(Integer number) {

return lamb -> lamb.getNumber() % 4 == number;}

@Override


s.getAnimals().stream().filter(checkIfLambIs(1))

.forEach(a -> a.setColor(null));


.forEach(a -> a.setColor(Color.YELLOW));


.forEach(a -> a.setColor(Color.CYAN));


.forEach(a -> a.setColor(Color.GREEN));}

Predicate


Фильтруем коллекции с Лямбдами



static Function<Color, Predicate<SpriteView>> checkIfLambColorIs

= color -> {Predicate<SpriteView> checkIfColorIs =

lamb -> lamb.getColor() == color;

return checkIfColorIs; };

@Override


mealsServed.set(mealsServed.get() +

s.getAnimals()

.filtered(checkIfLambColorIs.apply(todayEatableColor))

.size());

s.getAnimals()

.removeIf(checkIfLambColorIs.apply(todayEatableColor)); }

Function



@Override


Function<Color, Predicate<SpriteView>> checkIfLambColorIs =

color -> lamb -> lamb.getColor() ==

color;

mealsServed.set(mealsServed.get() +

s.getAnimals()

.filtered(checkIfLambColorIs.apply(todayEatableColor))

.size());

s.getAnimals()

.removeIf(checkIfLambColorIs.apply(todayEatableColor))}

Function


•Removes all elements that match the predicate Collection.removeIf();

•Filtering and replacement Collection.replaceAll();

•Returns collection filtered by predicate ObservableCollection.filtered();



•OpenSource project to demonstrate

Lambda features

•Visual representation of streams, filters,

maps

•Created by Stephen Chin, @steveonjava

Mary had a little Lambda

https://github.com/steveonjava/MaryHadALittleLambda


Reading


Java SE Embedded 8


Java SE 8 Embedded Platforms

JDK ARM SE

Linux ARM VFP hard float ABI

JRE SE Embedded Compact Profile Platforms

Linux x86

Linux ARM soft float

Linux ARM VFP soft float ABI

Linux ARM VFP hard float ABI

Linux Power PC e600

Linux Power PC e500v2


Java SE 8 Compact Profiles Profiles standardization

SE Full JRE

Hotspot VM

Lang & Util Base Libraries

Other Base Libraries

Integration Libraries

UI & Toolkits

Optional Components

Hotspot VM

Base Compact1 Classes

SE 8 Compact Profiles

Compact2 Class libraries

Compact3 Class libraries

1

2

3


Java SE 8 APIs java.io

java.lang

java.lang.annotation

java.lang.invoke

java.lang.ref

java.lang.reflect

java.math

java.net

java.nio

java.nio.channels

java.nio.channels.spi

java.nio.charset

java.nio.charset.spi

java.nio.file

java.nio.file.attribute

java.nio.file.spi

java.security

java.security.cert

java.security.interfaces

java.security.spec

java.text

java.text.spi

java.time

java.time.chrono

java.time.format

java.time.temporal

java.time.zone

java.util

java.util.concurrent

java.util.concurrent.atomic

java.util.concurrent.locks

java.util.function

java.util.jar

java.util.logging

java.util.regex

java.util.spi

java.util.stream

java.util.zip

javax.crypto

javax.crypto.interfaces

javax.crypto.spec

javax.net

javax.net.ssl

javax.script

javax.security.auth

javax.security.auth.callback

javax.security.auth.login

javax.security.auth.spi

javax.security.auth.x500

javax.security.cert

java.rmi

java.rmi.activation

java.rmi.dgc

java.rmi.registry

java.rmi.server

java.sql

javax.rmi.ssl

javax.sql

javax.transaction

javax.transaction.xa

javax.xml

javax.xml.datatype

javax.xml.namespace

javax.xml.parsers

javax.xml.stream

javax.xml.stream.events

javax.xml.stream.util

javax.xml.transform

javax.xml.transform.dom

javax.xml.transform.sax

javax.xml.transform.stax

javax.xml.transform.stream

javax.xml.validation

javax.xml.xpath

org.w3c.dom

org.w3c.dom.bootstrap

org.w3c.dom.events

org.w3c.dom.ls

org.xml.sax

org.xml.sax.ext

org.xml.sax.helpers

java.lang.instrument

java.lang.management

java.security.acl

java.util.prefs

javax.annotation.processing

javax.lang.model

javax.lang.model.element

javax.lang.model.type

javax.lang.model.util

javax.management

javax.management.loading

javax.management.modelmbean

javax.management.monitor

javax.management.openmbean

javax.management.relation

javax.management.remote

javax.management.remote.rmi

javax.management.timer

javax.naming

javax.naming.directory

javax.naming.event

javax.naming.ldap

javax.naming.spi

javax.security.auth.kerberos

javax.security.sasl

javax.sql.rowset

javax.sql.rowset.serial

javax.sql.rowset.spi

javax.tools

javax.xml.crypto

javax.xml.crypto.dom

javax.xml.crypto.dsig

javax.xml.crypto.dsig.dom

javax.xml.crypto.dsig.keyinfo

javax.xml.crypto.dsig.spec

org.ietf.jgss

java.applet

java.awt .**(13 packages)

java.beans

java.beans.beancontext

javax.accessibility

javax.activation

javax.activity

javax.annotation

javax.imageio

javax.imageio.event

javax.imageio.metadata

javax.imageio.plugins.bmp

javax.imageio.plugins.jpeg

javax.imageio.spi

javax.imageio.stream

javax.jws

javax.jws.soap

javax.print

javax.print.attribute

javax.print.attribute.standard

javax.print.event

javax.rmi

javax.rmi.CORBA

javax.sound.midi

javax.sound.midi.spi

javax.sound.sampled

javax.sound.sampled.spi

javax.swing.** (18 packages)

javax.xml.bind

javax.xml.bind.annotation

javax.xml.bind.annotation.adapters

javax.xml.bind.attachment

javax.xml.bind.helpers

javax.xml.bind.util

javax.xml.soap

javax.xml.ws

javax.xml.ws.handler

javax.xml.ws.handler.soap

javax.xml.ws.http

javax.xml.ws.soap

javax.xml.ws.spi

javax.xml.ws.spi.http

javax.xml.ws.wsaddressing

org.omg.** (28 packages)

compact1

compact1 compact2

compact2 compact3

compact3

Full Java SE

http://openjdk.java.net/jeps/161


Java SE 8 Embedded Profiles Linux x86_32 JRE static footprint comparison

compact1 Profile classes

Compact1

Embedded

JRE

Extensions (fx, nashorn, locales,... )

11Mb Client or Server Hotspot VM

Full JRE profile classes

Full JRE SE

Embedded

JRE SE

156Mb

Web start

Plugin

Control Panel

Deploy

49Mb

Client and Server Hotspot VM

Full JRE profile classes

Commercial features (JFR) Commercial features (JFR)

Minimal* Hotspot VM


Java SE 8 Embedded Profiles Graphics Footprint Savings over traditional SE Embedded

Swing/AWT/Java2D Classes

Hotspot VM

SE Embedded Runtime

Swing/AWT App

SE Embedded Graphics Stack

Minimal Hotspot VM

Compact1 Profile

Embedded Java FX App

FX Embedded Stack

X Server

Desktop/Window/Session Managers

Native Toolkit & X11 Libraries

Linux Kernel + Framebuffer driver

OpenGLES2 Library

Linux Kernel + Framebuffer driver

52MB 21MB

Java FX

graphics Java FX controls

EGL FB Direct FB


NetBeans

http://wiki.netbeans.org/JavaSEEmbeddedPlan

http://wiki.netbeans.org/JavaSEEmbeddedHowTo

http://wiki.netbeans.org/CompactProfiles

http://docs.oracle.com/javase/8/embedded/develop

-applications/develop-apps-in-netbeans.htm


Java SE 8 Embedded Compact Profiles Process used to create custom Java Embedded 8 Runtimes


JavaFX 8


JavaFX 8 New Stylesheet

Caspian vs Modena


JavaFX 8

New API for printing

– Currently only supported on desktop

Any node can be printed

Printing Support

PrinterJob job = PrinterJob.createPrinterJob(printer);

job.getJobSettings().setPageLayout(pageLayout);

job.getJobSettings().setPrintQuality(PrintQuality.HIGH);

job.getJobSettings().setPaperSource(PaperSource.MANUAL);

job.getJobSettings().setCollation(Collation.COLLATED);

if (job.printPage(someRichText))

job.endJob();


JavaFX 8

DatePicker

TreeTableView

New Controls


JavaFX 8

Gestures

– Swipe

– Scroll

– Rotate

– Zoom

Touch events and touch points

Touch Support


JavaFX 8

Predefined shapes

– Box

– Cylinder

– Sphere

User-defined shapes

– TriangleMesh, MeshView

PhongMaterial

Lighting

Cameras

3D Support


Резюме

Java SE 8

– Lambda выражения, streams и functions

– Type annotations

– Date & Time API

– Новые контролы, стили и поддержка 3D в JavaFX

NetBeans 8, IDE для Java 8

– Lambda, Embedded


А что дальше?


Java SE Roadmap

2015 2013 2014 2016

JDK 8 (Q1 2014) • Lambda

• JVM Convergence

• JavaScript Interop

• JavaFX 8

• 3D API

• Java SE Embedded support

• Enhanced HTML5 support

7u40 • Java Flight Recorder

• Java Mission Control 5.2

• Java Discovery Protocol

• Native memory tracking

• Deployment Rule Set

JDK 9 • Modularity – Jigsaw

• Interoperability

• Cloud

• Ease of Use

• JavaFX JSR

• Optimizations

NetBeans IDE 7.3 • New hints and refactoring

• Scene Builder Support

NetBeans IDE 8 • JDK 8 support

• Scene Builder 2.0 support

Scene Builder 2.0 • JavaFX 8 support

• Enhanced Java IDE support

NetBeans IDE 9 • JDK 9 support

• Scene Builder 3.0 support

Scene Builder 3.0 • JavaFX 9 support

7u21

• Java Client Security Enhancements

• App Store Packaging tools

JDK 8u20 • Deterministic G1

• Java Mission Control 6.0

• Improved JRE installer

• App bundling

enhancements

JDK 8u40

Scene Builder 1.1 • Linux support

Александр Белокрылов. java 8: create the future

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