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Uploaded byfbenault
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Java8

Java8 introduced several new features including lambda expressions, default methods, and streams. It also included a new date/time API and the Optional class to avoid null pointer exceptions. The document provides examples of using the new Optional class and date/time API in Java8, which was released in March 2014. It also outlines the history of Java versions leading up to Java8 and previews some future versions like Java9.

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Java8 By Franck Benault Created 27/06/2014 Last update 21/11/2014
Java8 plan
Historic of Java ● Past – Java 1.0 (1996) – Java 6 (2006) ● Present – Java7 (2011) – Java8 (18/03/2014) ● Future – Java9 (09/2016?) – Java10
Java8 : content ● Java8 JSR 337 – JSR 335 lambda – JSR 308 Annotation on Java types – JSR 310 New date time api – Optional
Java8 : optional ● Optional : wrapper of Object to avoid the nullPointerException management – Still exist in Guava (but not fully compliant with java8 version ● Samples : Person p = PersonQueries.findByName("Sophie"); Optional<Person> wrapper = Optional.ofNullable(p); //get now the person or get null Person p = wrapper.orElse(null);
Java8 : new java date API ● Close to Joda-time library ● Immutable classes (Thread safe) – LocalDate – LocalTime – LocalDateTime – Instant – ZonedDateTime – Period – Duration
Java8 : date API example1 ● Immutable classes (Thread safe) – LocalDate ● Creation (no public constructor) – LocalDate date = LocalDate.of(2015, Month.NOVEMBER, 17); – LocalDate date2 = LocalDate.now(); ● Usage (immutable) – date = date.minusWeeks(2);
How to use Java8 : EDI ● Intellj IDEA ● NetBeans IDE since 7.3 ● Eclipse – Kepler Release2 – Luna (4.4.0)
Java8 links ● My examples – https://github.com/franck-benault/test-java8
Java8 links ● My examples – https://github.com/franck-benault/test-java8