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Novidades do Java SE 8
1.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 132 Lambda, Nashorn, Metaspace: algumas novidades do Java SE 8 Bruno Borges Oracle Product Manager Java Evangelist @brunoborges
2.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 133 Bruno Borges Oracle Product Manager / Evangelist Desenvolvedor, Gamer, Beer Sommelier Entusiasta em Java Embedded e JavaFX Twitter: @brunoborges
3.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 134Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Agenda História Scene Graph Java API Properties Bindings Controls CSS WebView JFXPanel Charts
4.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 135 SE8
5.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 136 Um pouco da história Green Team, C++ ++ –, Oak - 1990 Java 1.0 / 1.1 – 1996 / 1997 Java 2 “J2SE” 1.2 – 1998 Java 1.3 ”J2SE 1.3” – 2000 Java 1.4 ”J2SE 1.4” – 2002 Java 1.5 “Java SE 5” - 2004 Java 1.6 “Java SE 6” - 2006 Java 1.7 “Java SE 7” - 2011
6.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 137 E o futuro...
7.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 138 E o JavaFX? É o sucessor do Java Swing
8.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 139 Disponível para... Windows, Linux, Mac OS X E em Preview... ARM* Apple iOS* Android* JavaFX 2.2 vem junto com JDK 7u6+ Standalone para Java 6
9.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1310 OpenJFX JavaFX open sourced! http://openjdk.java.net/projects/openjfx/
10.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1311Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Java SE 8 Melhorias em interfaces
11.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1312 Java SE 8 – Melhorias em Interfaces Static methods Métodos com implementação default Functional Interfaces toda interface que define apenas 1 método abstrato (sem corpo) @FunctionalInterface: similar a @Override, para garantia public default void forEach(Consumer<? super T> action) { Objects.requireNonNull(action); for (T t : this) { action.accept(t); } }
12.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1313Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Java SE 8 Melhorias em interfaces Lambdas
13.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1314 Java SE 8 – Lambdas Lista de inputs tipados à esquerda, bloco com retorno à direita Input à esquerda, void à direita Métodos estáticos e de objetos como funções lambda (int x, int y) -> { return x + y; } (x, y) -> x + y x -> x * x () -> x x -> { System.out.println(x); } String::valueOf x -> String.valueOf(x) Object::toString x -> x.toString() x::toString () -> x.toString() ArrayList::new () -> new ArrayList<>()
14.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1315 Java SE 8 – Lambdas (cont.) Em busca de um match para saber qual construtor/método chamar O método compare precisa de dois parâmetros, e deve retornar int. A expressão lambda condiz com esta assinatura, logo a expressão é válida Expressões não devem modificar variáveis definidas fora do corpo lambda Comparator<String> c = (a, b) -> Integer.compare(a.length(), b.length()); int count = 0; List<String> strings = Arrays.asList("a", "b", "c"); strings.forEach(s -> { count++; // error: can't modify the value of count });
15.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1316 Java SE 8 – Lambdas (cont.) Classes abstratas não podem ser instanciadas com lambda poderia esconder código (construtor por exemplo) elimina possibilidade de otimizações futuras Solução: factory methods Ordering<String> order = (a, b) -> ...; CacheLoader<String, String> loader = (key) -> ...; Ordering<String> order = Ordering.from((a, b) -> ...); CacheLoader<String, String> loader = CacheLoader.from((key) -> ...);
16.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1317 Java SE 8 – Lambdas (cont.) Novos pacotes: java.util.stream: suporta operações em valores de stream, com expressões lambda java.util.function: interfaces funcionais utilitárias do JDK int sumOfWeights = blocks.stream().filter(b -> b.getColor() == RED) .mapToInt(b -> b.getWeight()) .sum(); // In Java 7: foo(Utility.<Type>bar()); Utility.<Type>foo().bar(); // In Java 8: foo(Utility.bar()); Utility.foo().bar();
17.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1318 Java SE 8 – Lambdas: Antes e Depois public void emailDraftees(List<Person> pl) { for(Person p : pl){ if (p.getAge() >= 18 && p.getAge() <= 25 && p.getGender() == Gender.MALE) { roboEmail(p); } } }
18.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1319 Java SE 8 – Lambdas: Antes e Depois public void emailDraftees(List<Person> pl) { for(Person p : pl) { if (isDraftee(p)) { roboEmail(p); } } } public boolean isDraftee(Person p){ return p.getAge() >= 18 && p.getAge() <= 25 && p.getGender() == Gender.MALE; }
19.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1320 Java SE 8 – Lambdas: Antes e Depois Predicate<Person> draftees; draftees = p -> p.getAge() >= 18 && p.getAge() <= 25 && p.getGender() == Gender.MALE; robo.emailContacts(pl, allDraftees); public void emailContacts(List<Person> pl, Predicate<Person> pred) { for(Person p : pl) if (pred.test(p)) roboEmail(p); }
20.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1321Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Java SE 8 Melhorias em interfaces Lambdas Generics
21.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1322 Java SE 8 – Generics Inferência de tipos genéricos // In Java 7: foo(Utility.<Type>bar()); Utility.<Type>foo().bar(); // In Java 8: foo(Utility.bar()); Utility.foo().bar();
22.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1323Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Java SE 8 Melhorias em interfaces Lambdas Generics Date and Time API
23.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1324 Java SE 8 – Date and Time Mudança total da API para lidar com data, hora, calendário Baseado no JodaTime – JSR 310 Novas classes: LocalDateTime, LocalDate, LocalTime Year, YearMonth, Month, MonthDay, DayOfWeek Instant, ZonedDateTime, OffsetTime, Duration, Period
24.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1325Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 16 Java SE 8 Melhorias em interfaces Lambdas Generics Date and Time API Outras APIs
25.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1326 Java SE 8 – Outras mudanças de API Reflection API Manipular lambdas, anotações, etc Annotations Permite definir anotação no tipo genérico Novos métodos em IO/NIO (busca recursiva de arquivo/diretorio) Concurrency API Collections API List<@Nullable String>
26.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1327 DEMO Antes e depois do Java SE 8
27.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1328 Nashorn Javascript the right way
28.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1329 Oracle Nashorn? É o sucessor do Mozilla Rhino
29.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1330 Nashorn Engine de processamento da linguagem Javascript Escrito do zero Seguindo boas práticas Novas técnicas e algoritmos Atento às otimizações da JVM (ex: invokedynamic) Projeto mantido pela Oracle, e Open Source Incluído no OpenJDK em 21/12/12
30.
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Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1331 Nashorn – Diferenciais? Maior integração com a camada Java Integração com aplicações JavaFX Utilizado nos componentes WebView e HTML5 Maior performance Menor footprint de memória
31.
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Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1332 DEMO JavaFX usando Nashorn
32.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1333 Metaspace Say goodbye to OutOfMemoryError
33.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1334 Metaspace Substitui a PermGen Modelo já utilizado pela JVM Oracle JRockit Por padrão, o tamanho é variável – ótimo para desenvolvimento Em produção, deve ser limitado – novo parâmetro: -XX:MaxMetaspaceSize – parâmetros *PermGen ignorados pela VM Dados armazenados “off-heap” Limitado ao tamanho de memória disponível na máquina
34.
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Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1335 Perguntas?
35.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1336 OBRIGADO! @brunoborges blogs.oracle.com/brunoborges
36.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1337 The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
37.
Copyright © 2012,
Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1338
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