Functional Programming in Java
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Functional programming has started (re)gaining prominence in recent years, and with good reason too. Functional programs lend an elegant solution to the concurrency problem, result in more modular systems, are more concise and are easier to test. While modern languages like Scala and Clojure have embraced the functional style whole-heartedly, Java has lagged a bit behind in its treatment of functions as first-class citizens. With the advent of Java 8 and its support for lambdas, however, Java programmers can finally start reaping the power of functional programs as well. Even without Java 8, it is possible to adopt a functional style with the aid of excellent libraries such as Guava.
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Nous allons aussi pouvoir découvrir les différentes méthodologies et approches afin de pouvoir configurer, déployer et exploiter correctement différents périphériques de sécurité (HIDS, IDS, VPN, Firewall), la supervision des réseaux informatiques, la gestion des backups, ainsi que la découverte d’une nouvelle notion tout aussi importante et qui concerne la sécurité organisationnelle (Avec la gestion du risque et des incidents de sécurité informatique).
Alphorm.com Java 8: les nouveautés
Formation complète ici:
http://www.alphorm.com/tutoriel/formation-en-ligne-java-8-les-nouveautes
La formation va concerner tous les horizons nouveaux de Java : nous commencerons par les nouveautés syntaxiques, comme les expressions lambdas, couplées ou non aux streams, qui ouvrent la porte à une nouvelle façon de programmer.
La formation va aussi dévoiler des nouveautés dans les APIs Java, dans les classes de collections, les classes de gestion de la concurrence et des réseaux.
La partie graphique avec JavaFX sera présentée, puisque cette API remplace Swing à compter de Java8.
Ensuite nous présenterons les nouvelles classes de gestion des dates et du temps.
Les nouveautés dans le domaine de la sécurité seront abordées, avec le support de nouveaux algorithmes.
Enfin, nous parlerons des outils nouveaux ou modifiés, y compris le moteur js.
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- 1. Functional Programming in Java Prem Chandrasekaran & Jorge Lee ThoughtWorks Inc. Jan 29th 2014
- 4. Product
- 5. Item
- 6. Warehouse
- 7. Task 1 - Print names of all items in inventory
- 8. In Java 6…
- 9. Task 2 - Print names of all in-stock items of a category
- 10. Implementation
- 11. Now We Have…
- 12. Issues? • Too much duplication • Not sustainable • Too brittle
- 13. Issues? We need to externalize the search criteria
- 14. Refactor #1
- 15. Refactor #1
- 16. Refactor #1
- 17. Refactor #1
- 18. Refactor #2
- 19. Recap…
- 20. Now We Have…
- 21. Task 3 - Search for Products by name
- 23. Now We Have…
- 24. Can we Refactor?
- 25. And Now…
- 27. IDE Magic!
- 28. That’s It! For Java 6
- 29. Enter Java 8
- 30. We Have…
- 31. Refactor #3 - Lambdas
- 32. Refactor #4 - No Types Necessary
- 33. Refactor #5 - Method References
- 34. Java 8 Gyaan • Functional Interface • Interface with a single method without an implementation • Can be enforced using the @FunctionalInterface annotation • There are several standard functional interfaces defined in the java.lang.function package
- 35. So…
- 36. Becomes…
- 38. Task 4 - Filter in-stock items and print the Item not just its name
- 39. We Have…
- 40. Becomes…
- 41. We Can Also…
- 42. Task 5 - Print the number of items in inventory
- 43. In Java 6…
- 44. What are we doing? 1. Providing an initial/default value 2. Accumulating a result 3. Combining the result
- 46. Alternatively…
- 47. Alternatively…
- 48. Conveniently
- 49. Task 6 - Print number of items in all our warehouses
- 50. In Java 6…
- 52. Also We Can…
- 53. Task 7 - Print the item with the least amount across warehouses
- 54. In Java 6
- 56. Conveniently
- 59. Why Functional? • A newer different way of thinking • More modular • Side-effect free programs • Immutable programs • • Easier to write concurrent code Easier to test
- 60. What to do in Java 6? • Look in the Guava or Apache Commons Lang3 library • But… “As of Java 7, functional programming in Java can only be approximated through awkward and verbose use of anonymous classes. This is expected to change in Java 8, but Guava is currently aimed at users of Java 5 and above.! Excessive use of Guava's functional programming idioms can lead to verbose, confusing, unreadable, and inefficient code. These are by far the most easily (and most commonly) abused parts of Guava, and when you go to preposterous lengths to make your code "a one-liner," the Guava team weeps.” — Guava Documentation
- 61. What to do in Java 6 • First — Stop Whining • Prefer final variables • Minimize the use of void methods • Avoid use of mutable globals (statics) • Avoid returning nulls • Read Effective Java - And apply learnings!
- 62. Thank You!