Java 8 Lambda
2 likes1,611 views
Here are a few thoughts in response to your questions: - Lambda expressions will significantly improve readability and reduce noise in Java code by allowing for more concise one-liners compared to anonymous inner classes. However, debugging lambdas could potentially be more challenging since they are anonymous by nature. Tools and IDE support will need to evolve to help with this. - With features like lambdas and default methods, Java 8 aims to become more competitive with languages like C# and Scala that already have closures and functional capabilities. However, Java's large existing code base and ecosystem give it advantages over newer languages. - For Java 8 to be widely adopted, projects should start evaluating and migrating to it as early access
![More Expressiveness
More Readability
结果 汉字 = new 物().処理();
vs.
fact n = product [1..n]
Is it all Chinese to you?](https://image.slidesharecdn.com/java8lambda-121004233258-phpapp02/85/Java-8-Lambda-10-320.jpg)
![Around Project Lambda
In France
JDK 8: lambdas in Action [FR]
http://www.devoxx. O. Croisier
com/display/FR12/JDK+8+demo++lambdas+in
+Action
G. Tardif
Java 8 et les Lambda [FR]
http://thecodersbreakfast.net/index.php?
post/2012/05/30/Java-8-et-les-Lambda
Curious about Project Lambda ;)
http://blog.xebia.fr/ [FR]
http://kerflyn.wordpress.com/ Guess
Who?](https://image.slidesharecdn.com/java8lambda-121004233258-phpapp02/85/Java-8-Lambda-32-320.jpg)
Ad
More Related Content
What's hot (20)
Similar to Java 8 Lambda (20)
Ad
Recently uploaded (20)
Ad
Java 8 Lambda
- 1. JSR 335: λ Project Lambda François Sarradin -- Xebia
- 2. Java Roadmap 337 Java 7 JSR Java 8 jul. 2011 aug. 2013 Java 9 ? Modularity Performance ● FP / Parallel comp. Productivity ● Date API improv. ● Type annotation ● Compact profiles ● Nashorn
- 3. Project Lambda What's in it? Project Lambda JSR335 Virtual Extension Lambda Expression Method Collection API Collection API Functional API Parallel Collections Bulk Operations
- 4. Question What will be the impact of Project Lambda on the Java world?
- 5. Answer Look at Speed Car!
- 6. Planning... Presentation + live coding (free to interrupt) ● Genesis ● Lambda of Java ● Project Lambda
- 7. ...And Then ● Debate ● Retrospective (agile style!) ● Report ○ Xebia blog ○ Project Lambda ML
- 8. Genesis
- 10. More Expressiveness More Readability 结果 汉字 = new 物().処理(); vs. fact n = product [1..n] Is it all Chinese to you?
- 11. FP & Competition Clojure C++ C# / F# Guava
- 12. (Anonymous) Inner Class A λ Solution Iterables.filter(persons, new Predicate<Person>() { @Override public boolean apply(Person person) { return person.getAge() >= 18; } }); // Java + Guava
- 13. (Anonymous) Inner Class A (better?) λ Solution Iterables.filter(persons, IS_ADULT); Predicate<Person> IS_ADULT = new Predicate<Person>() { @Override public boolean apply(Person person) { return person.getAge() >= 18; } }); This is what you really need!
- 14. (Anonymous) Inner Class (Not Really) A λ Solution ● "The pain of anonymous inner classes makes us roll our eyes in the back of our heads every day." (a wise Oracle's client, 01/2011) Average length of Java one-liner is 21 line! @DEVOPS_BORAT - 12/09/2011
- 15. What about Oracle? ● "It’s time to add closures to Java" (Mark Reinhold, 12/2009) ● "Oracle's position is that Java must evolve -- carefully, of course -- in order to remain competitive." (Brian Goetz - 08/2011)
- 16. Lambda of Java
- 17. Here is the λ! (int x, int y) -> { return x + y; } (x, y) -> { return x + y; } (int x, int y) -> x + y (x, y) -> x + y
- 18. Other λ forms x -> 2 * x () -> 42 m -> { m.put("France", "Paris"); m.put("UK", "London"); m.put("USA", "Washington"); }
- 19. Inner Class vs. λ Solution Iterables.filter(persons, new Predicate<Person>() { @Override public boolean apply(Person p) { return p.getAge() >= 18; } }); // Java 5-7 + Guava Iterables.filter(persons, // Java 8 + Guava p -> p.getAge() >= 18);
- 20. Method Reference String::valueOf // like: v -> String.valueOf(v) Integer::compare // like: (i1, i2) -> Integer.compare(i1, i2) Arrays.sort(myInts, Integer::compare)
- 21. Virtual Extension Method (VEM) interface Message { String getMessage() default { return "Look Ma'! Interface with code!"; } }
- 22. VEM Motivation VEM eg. Collection API Help to extend existing APIs Minimize rewrite of existing API implementation eg. Hibernate Collection Implementation
- 23. Collection API Extended java.util.functions.* java.util.streams.* Extension of Iterable, Iterator, Collection, Map, ... java.util.Optional
- 24. Parallel Computing As Easy as 1-2-3? myCollection.stream() .filter(x -> ...) .map(x -> ...) .reduce((x, y) -> ...) // sequential myCollection.parallel() .filter(x -> ...) .map(x -> ...) .reduce((x, y) -> ...) // parallel
- 25. Some kata and demos...
- 26. Project Lambda
- 27. The Dream Team ;) photo: @crazybob
- 28. Web Sites JSR335 http://jcp.org/en/jsr/detail?id=335 OpenJDK 8 Web site http://openjdk.java.net/projects/lambda/
- 29. Where to Get Java 8 Java SE 8 Early Access (with lambda) http://jdk8.java.net/lambda/ Mercurial repo http://hg.openjdk.java.net/lambda/lambda
- 30. Mailing Lists Technical Discussion mailto:[email protected] http://mail.openjdk.java.net/pipermail/lambda-dev/ Libs Spec Discussion http://mail.openjdk.java.net/pipermail/lambda-libs-spec-<*>/ Spec Discussion http://mail.openjdk.java.net/pipermail/lambda-spec-<*>/
- 31. Around Project Lambda OpenJDK OSX Build (7 & 8) http://code.google.com/p/openjdk-osx-build/ H. Gomez Java 8 vs Scala: a Feature Comparison http://www.infoq.com/articles/java-8-vs-scala S. van den Berg U. Peter
- 32. Around Project Lambda In France JDK 8: lambdas in Action [FR] http://www.devoxx. O. Croisier com/display/FR12/JDK+8+demo++lambdas+in +Action G. Tardif Java 8 et les Lambda [FR] http://thecodersbreakfast.net/index.php? post/2012/05/30/Java-8-et-les-Lambda Curious about Project Lambda ;) http://blog.xebia.fr/ [FR] http://kerflyn.wordpress.com/ Guess Who?
- 33. Project Lambda and the Community ● Transparency ○ Presentations / Publications ○ Source code available ● Early testing by community ○ Pre-version available ○ AdoptOpenJDK (http://java. net/projects/adoptopenjdk/pages/AdoptOpenJDK) ● Quick feedback ○ ML, Hackdays
- 34. Question ● Oneliner, Readability, and Debugability ● Java vs. Competitors ● What to do for Java 8 to be adopted in projects? ● Is there a future for Java?