50 new things you can do with java 8
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The slides of my Devoxx talk 50 new things you can do in Java 8.
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Java 8-streams-collectors-patterns
Java 8-streams-collectors-patternsJosé Paumard Ma présentation sur l'API Stream, les Collectors, de Devoxx France 2014.
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Autumn collection JavaOne 2014José Paumard The document appears to be notes from a presentation on Java 8 lambdas and functional programming concepts like mapping, filtering, and reducing collections of objects. It introduces lambda expressions as a more concise way to represent functions compared to anonymous inner classes in Java 7. Examples are provided of using lambdas with interfaces like Mapper, Predicate, and Reducer to process a List of Person objects by mapping to ages, filtering adults, and reducing to a sum. Corner cases and limitations of reduction operations are also briefly discussed.
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Java 8, Streams & Collectors, patterns, performances and parallelization
Java 8, Streams & Collectors, patterns, performances and parallelizationJosé Paumard This document discusses Java 8 streams and collectors. It provides an overview of streams, operations on streams like forEach(), filter(), and peek(), and functional interfaces like Consumer and Predicate. It notes that streams efficiently process data in a parallel and pipelined manner without storing intermediate data. Key points covered include what streams are, how to create them from collections, common stream operations, and issues around concurrency with mutable operations.
JDK 8, lambdas, streams, collectors - Bretagne Tour
JDK 8, lambdas, streams, collectors - Bretagne TourJosé Paumard L'API la plus utilisée du JDK est sans aucun doute l'API Collection. Brillamment conçue il y a un peu plus de 15 ans, elle est encore aujourd'hui au coeur de toutes les applications Java. En 2004, elle a subi son premier lifting, avec l'introduction des génériques. Cette mise à jour, bien qu'importante, n'a cependant pas modifié ses patterns d'utilisation. Avec l'introduction des lambdas en Java 8, l'API Collection est à nouveau réécrite, mais cette fois la situation est différente : ses patterns d'utilisation sont complètement changés.
La première partie de cette conférence introduit les lambda expressions, comment les écrire, et ce qu'elle nous apportent en tant que développeurs. La deuxième partir présente en détail les nouveaux patterns introduits par les API Stream et Collector. Ces nouvelles API vont changer la façon dont nous allons pouvoir traiter les collections de grande taille, y compris en parallèle, avec un modèle de programmation très simple, et des patterns très puissants. Cette puissance sera montrée dans des exemples réels, qui monteront comment Java 8 va pouvoir nous aider à écrire simplement du code efficace et performant.
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Loom Virtual Threads in the JDK 19
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From Java 11 to 17 and beyond.pdfJosé Paumard The features released between Java 11 and Java 17 have brought a greater opportunity for developers to improve application development productivity as well and code expressiveness and readability. In this deep-dive session, you will discover all the recent Project Amber features added to the Java language such as Text blocks, Records (including Records serialization), Pattern Matching for instanceof, switch expression, sealed classes, and pattern matching for switch. The main goal of the Amber Project is to bring Pattern Matching to the Java platform, which will impact both the language and the JDK APIs. You will discover record patterns, array patterns, as well as deconstruction patterns, through constructors, factory methods, and deconstructors.
The Future of Java: Records, Sealed Classes and Pattern Matching
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Deep Dive Java 17 Devoxx UKJosé Paumard The features released between Java 11 and Java 17 have brought a greater opportunity for developers to improve application development productivity as well and code expressiveness and readability. In this deep-dive session, you will discover all the recent Project Amber features added to the Java language such as Records (including Records serialization), Pattern Matching for `instanceof`, switch expression, sealed classes, and hidden classes. The main goal of the Amber Project is to bring Pattern Matching to the Java platform, which will impact both the language and the JDK APsI. You will discover record patterns, array patterns, as well as deconstruction patterns, through constructors, factory methods, and deconstructors.
You can find the code shown here: https://github.com/JosePaumard/devoxx-uk-2021
Designing functional and fluent API: application to some GoF patterns
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Functional programmers have been saying for decades that they know the way to the future. Clearly they've been wrong, since imperative languages are still far more popular. Clearly they've also been right, as the advantages of functional programming have become increasingly obvious. Is it possible to combine the two models? Scala is one language that does this, and Java too has been on a journey, which still continues, of learning from functional languages and carefully adding features from them. In this talk, we'll review what Java has learned from functional languages, what it can still learn, and how its added features compare to Scala's original ones.
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The Sincerest Form of FlatteryJosé Paumard The document discusses the evolution of functional programming features in Java and Scala over time. It notes that Scala was able to adopt features like generics, higher-order functions, and pattern matching earlier than Java due to not having backwards compatibility constraints. Java gradually added these features in pieces (generics in 2004, higher-order functions in 2014, pattern matching is upcoming) while Scala incorporated them as a whole when it launched in 2004. The document also examines some of the challenges Java faced in implementing these features due to its type erasure approach to generics and desire to maintain backwards compatibility.
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Designing functional and fluent API: example of the Visitor PatternJosé Paumard This is the slide deck of my talk from Devoxx Belgium 2019. You can watch the video here https://www.youtube.com/watch?v=gq23w9nycBs and get the code here: https://github.com/JosePaumard/devoxx-belgium-2019-visitor-lambda.
Among the patterns from the GoF, the Visitor is probably the more complex to implement. One of the difficulties is that you need to implement it in your object model, leading to complex refactoring for legacy applications. Based on the use of all the nifty tools brought by functional programming: chaining, composition, and partial application, you can implement Visitors without having to change your object model, using a functional and fluent API. This approach can be used to implement other patterns: Builder and Validator. Using this way of designing API leads to readable and robust code, designed following the GoF patterns.
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Le JDK est open source et son développement aussi. L'ensemble des nouveautés vit sur des branches Mercurial qui peuvent être téléchargées et compilées à la demande. Cela permet de jouer avec des fonctionnalités encore en chantier, de regarder comment les nouvelles syntaxes fonctionneront, bref, de jouer avec un JDK du futur, qui n'existera peut-être jamais. L'objet de ce tools in action est simple : montrer comment tout ceci fonctionne, de l'installation d'une machine Ubuntu à l'exécution d'un JDK recompilé maison.
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Comme promis, Java sort sa version majeure tous les 6 mois. Le train passe et amène son lot de nouveautés. Parmi elles, certaines sont sorties : une nouvelle syntaxe pour les clauses switch et l'instruction de byte code CONSTANT_DYNAMIC. D'autres sont en chantier, plus ou moins avancé : une nouvelle façon d'écrire des méthodes de façon condensée, un instanceof 'intelligent', des constantes évaluées au moment où elles sont utilisées. Les projets progressent. Loom, et son nouveau modèle de programmation concurrente que l'ont peut tester avec Jetty. Amber, qui introduit les data types et des nouvelles syntaxes. Valhalla, dont les value types donnent leurs premiers résultats. S'il est difficile de prévoir une date de sortie pour ces nouveautés, on sait en revanche qu'une fois prêtes elles sortiront en moins de 6 mois. De tout ceci nous parlerons donc au futur et en public, avec des démonstrations de code, des slides, du code, de la joie et de la bonne humeur !
Lambdas and Streams Master Class Part 2
Lambdas and Streams Master Class Part 2José Paumard These are the slides of the talk we made with Stuart Marks at Devoxx Belgium 2018. This second part covers the Stream API, reduction and the Collector API.
What is the state of lambda expressions in Java 11? Lambda expressions are the major feature of Java 8, having an impact on most of the API, including the Streams and Collections API. We are now living the Java 11 days; new features have been added and new patterns have emerged. This highly technical Deep Dive session will visit all these patterns, the well-known ones and the new ones, in an interactive hybrid of lecture and laboratory. We present a technique and show how it helps solve a problem. We then present another problem, and give you some time to solve it yourself. Finally, we present a solution, and open for questions, comments, and discussion. Bring your laptop set up with JDK 11 and your favorite IDE, and be prepared to think!
Lambda and Stream Master class - part 1
Lambda and Stream Master class - part 1José Paumard These are the slides of the talk we made with Stuart Marks at Devoxx Belgium 2018. This first part covers Lambda Expressions and API design with functional interfaces.
What is the state of lambda expressions in Java 11? Lambda expressions are the major feature of Java 8, having an impact on most of the API, including the Streams and Collections API. We are now living the Java 11 days; new features have been added and new patterns have emerged. This highly technical Deep Dive session will visit all these patterns, the well-known ones and the new ones, in an interactive hybrid of lecture and laboratory. We present a technique and show how it helps solve a problem. We then present another problem, and give you some time to solve it yourself. Finally, we present a solution, and open for questions, comments, and discussion. Bring your laptop set up with JDK 11 and your favorite IDE, and be prepared to think!
Asynchronous Systems with Fn Flow
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The FnProject was released about a year ago, proposing new ways to design asynchronous systems in a very flexible way. This tutorial shows you how to set up a Fn Server on a local development machine running Windows with a first simple function. Then we cover the design of multi-functions systems, connected together in an asynchronous way, leveraging the Fn Flow API. This API is first presented, including how it compares to the the Java 8 CompletableFuture API. We then set up a real example made of several functions, producing multiple results and see how we can leverage their asynchronous nature to make a non-blocking system, handling errors in a simple and intuitive way. Most of the examples are shown both on slides and live coding parts.
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Cela viendra-t-il en 11, 12, 15 ? Ne spéculons pas, mais quand ces nouveautés seront prêtes, elles sortiront en quelques mois. On se propose de présenter ces nouveautés, celles qui sont presque prêtes, celles qui seront prêtes bientôt, et celles qui ne seront pas prêtes avant un moment. Quels seront les impacts sur le langage, sur la JVM et donc sur les performances ? Que cela va-t-il nous apporter au quotidien, en tant que développeurs ? Quels seront les nouveaux patterns ? Voici le programme de cette présentation, avec des slides, du code, de la joie et de la bonne humeur !
JAX-RS and CDI Bike the (Reactive) Bridge
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Collectors in the Wild
Collectors in the WildJosé Paumard The slides of my talk at Devoxx BE 2017. This in depth talk is all about collectors: those available, because we need to know them, those that we can create, those we had no idea they could be created, and the others, as there is in fact no limit to what can be done with this API. The concept of downstream collector will be used to show how we can write entire data processing pipelines using collectors only, and pass them as parameters to other pipelines.
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Streams in the wildJosé Paumard The slides of my Java One 2017 talk about the Spliterator Patterns, or, how to extend the Stream API using the Spliterator API.
The video is available on YouTube: https://www.youtube.com/watch?v=xgHGpsubL5M
JAX RS and CDI bike the reactive bridge
JAX RS and CDI bike the reactive bridgeJosé Paumard The slides of our talk with David Delabassee about the reactive extensions introduced in JAX RS 2.2 and CDI 2.0, in Java EE 8.
Free your lambdas
Free your lambdasJosé Paumard The slides of my JavaOne 2017 talk. It describes how you can create API using functional interfaces, default and static methods starting with Java 8. You can watch the video here: https://www.youtube.com/watch?v=64UO1YjVcZ0
L'API Collector dans tous ses états
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Introduite en Java 8, l'API Collector vit dans l'ombre de l'API Stream, ce qui est logique puisqu'un collecteur doit se connecter à un stream pour fonctionner. Le JDK est organisé de sorte que l'on utilise surtout les collectors sur étagère : groupingBy, counting et quelques autres. Ces deux éléments masquent non seulement le modèle de traitement de données des collectors, mais aussi sa puissance et ses performances.
Ces présentation parle des collectors qui existent et qu'il faut connaître, ceux que l'on peut créer, ceux dont on se doute que l'on peut les créer une fois que l'on comprend un peu les choses, et les autres, tant les possibilités offertes par cette API sont illimitées.
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Linked to ArrayList: the full storyJosé Paumard The slides of my university talk, Devoxx Belgium 2016.
The goal of this talk is to compare the two most popular implementations of List: LinkedList and ArrayList, and provide hints on which one to use in what case.
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You can find the code shown here: https://github.com/JosePaumard/devoxx-uk-2021
Designing functional and fluent API: application to some GoF patterns
Designing functional and fluent API: application to some GoF patternsJosé Paumard These are the slides of my Devnexus 2020 talk. The code is avaiblable on my GitHub account: https://github.com/JosePaumard/devnexus-2020-visitor-lambda. You can see a replay of this talk (in a slightly different version) here: https://youtu.be/gq23w9nycBs
The Sincerest Form of Flattery
The Sincerest Form of FlatteryJosé Paumard Those are the slides of the presentation we made with Maurice Naftalin à Goto: Copenhagen 2019.
Functional programmers have been saying for decades that they know the way to the future. Clearly they've been wrong, since imperative languages are still far more popular. Clearly they've also been right, as the advantages of functional programming have become increasingly obvious. Is it possible to combine the two models? Scala is one language that does this, and Java too has been on a journey, which still continues, of learning from functional languages and carefully adding features from them. In this talk, we'll review what Java has learned from functional languages, what it can still learn, and how its added features compare to Scala's original ones.
The Sincerest Form of Flattery
The Sincerest Form of FlatteryJosé Paumard The document discusses the evolution of functional programming features in Java and Scala over time. It notes that Scala was able to adopt features like generics, higher-order functions, and pattern matching earlier than Java due to not having backwards compatibility constraints. Java gradually added these features in pieces (generics in 2004, higher-order functions in 2014, pattern matching is upcoming) while Scala incorporated them as a whole when it launched in 2004. The document also examines some of the challenges Java faced in implementing these features due to its type erasure approach to generics and desire to maintain backwards compatibility.
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Among the patterns from the GoF, the Visitor is probably the more complex to implement. One of the difficulties is that you need to implement it in your object model, leading to complex refactoring for legacy applications. Based on the use of all the nifty tools brought by functional programming: chaining, composition, and partial application, you can implement Visitors without having to change your object model, using a functional and fluent API. This approach can be used to implement other patterns: Builder and Validator. Using this way of designing API leads to readable and robust code, designed following the GoF patterns.
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Le JDK est open source et son développement aussi. L'ensemble des nouveautés vit sur des branches Mercurial qui peuvent être téléchargées et compilées à la demande. Cela permet de jouer avec des fonctionnalités encore en chantier, de regarder comment les nouvelles syntaxes fonctionneront, bref, de jouer avec un JDK du futur, qui n'existera peut-être jamais. L'objet de ce tools in action est simple : montrer comment tout ceci fonctionne, de l'installation d'une machine Ubuntu à l'exécution d'un JDK recompilé maison.
Java Keeps Throttling Up!
Java Keeps Throttling Up!José Paumard Le slide deck de l'Université que nous avons donnée avec Rémi Forax à Devoxx France 2019.
Comme promis, Java sort sa version majeure tous les 6 mois. Le train passe et amène son lot de nouveautés. Parmi elles, certaines sont sorties : une nouvelle syntaxe pour les clauses switch et l'instruction de byte code CONSTANT_DYNAMIC. D'autres sont en chantier, plus ou moins avancé : une nouvelle façon d'écrire des méthodes de façon condensée, un instanceof 'intelligent', des constantes évaluées au moment où elles sont utilisées. Les projets progressent. Loom, et son nouveau modèle de programmation concurrente que l'ont peut tester avec Jetty. Amber, qui introduit les data types et des nouvelles syntaxes. Valhalla, dont les value types donnent leurs premiers résultats. S'il est difficile de prévoir une date de sortie pour ces nouveautés, on sait en revanche qu'une fois prêtes elles sortiront en moins de 6 mois. De tout ceci nous parlerons donc au futur et en public, avec des démonstrations de code, des slides, du code, de la joie et de la bonne humeur !
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Lambda and Stream Master class - part 1
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What is the state of lambda expressions in Java 11? Lambda expressions are the major feature of Java 8, having an impact on most of the API, including the Streams and Collections API. We are now living the Java 11 days; new features have been added and new patterns have emerged. This highly technical Deep Dive session will visit all these patterns, the well-known ones and the new ones, in an interactive hybrid of lecture and laboratory. We present a technique and show how it helps solve a problem. We then present another problem, and give you some time to solve it yourself. Finally, we present a solution, and open for questions, comments, and discussion. Bring your laptop set up with JDK 11 and your favorite IDE, and be prepared to think!
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The FnProject was released about a year ago, proposing new ways to design asynchronous systems in a very flexible way. This tutorial shows you how to set up a Fn Server on a local development machine running Windows with a first simple function. Then we cover the design of multi-functions systems, connected together in an asynchronous way, leveraging the Fn Flow API. This API is first presented, including how it compares to the the Java 8 CompletableFuture API. We then set up a real example made of several functions, producing multiple results and see how we can leverage their asynchronous nature to make a non-blocking system, handling errors in a simple and intuitive way. Most of the examples are shown both on slides and live coding parts.
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Cela viendra-t-il en 11, 12, 15 ? Ne spéculons pas, mais quand ces nouveautés seront prêtes, elles sortiront en quelques mois. On se propose de présenter ces nouveautés, celles qui sont presque prêtes, celles qui seront prêtes bientôt, et celles qui ne seront pas prêtes avant un moment. Quels seront les impacts sur le langage, sur la JVM et donc sur les performances ? Que cela va-t-il nous apporter au quotidien, en tant que développeurs ? Quels seront les nouveaux patterns ? Voici le programme de cette présentation, avec des slides, du code, de la joie et de la bonne humeur !
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Collectors in the Wild
Collectors in the WildJosé Paumard The slides of my talk at Devoxx BE 2017. This in depth talk is all about collectors: those available, because we need to know them, those that we can create, those we had no idea they could be created, and the others, as there is in fact no limit to what can be done with this API. The concept of downstream collector will be used to show how we can write entire data processing pipelines using collectors only, and pass them as parameters to other pipelines.
Streams in the wild
Streams in the wildJosé Paumard The slides of my Java One 2017 talk about the Spliterator Patterns, or, how to extend the Stream API using the Spliterator API.
The video is available on YouTube: https://www.youtube.com/watch?v=xgHGpsubL5M
JAX RS and CDI bike the reactive bridge
JAX RS and CDI bike the reactive bridgeJosé Paumard The slides of our talk with David Delabassee about the reactive extensions introduced in JAX RS 2.2 and CDI 2.0, in Java EE 8.
Free your lambdas
Free your lambdasJosé Paumard The slides of my JavaOne 2017 talk. It describes how you can create API using functional interfaces, default and static methods starting with Java 8. You can watch the video here: https://www.youtube.com/watch?v=64UO1YjVcZ0
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• New Mexico: 67 (+1 )(92.4% of the cases are from Eddy County)
• Oklahoma: 16 (+1)
• Kansas: 46 (32% of the cases are from Gray County)
HOSPITALIZATIONS: 97 (+2)
• Texas: 89 (+2) - This is 13.02% of all TX cases.
• New Mexico: 7 - This is 10.6% of all NM cases.
• Kansas: 1 - This is 2.7% of all KS cases.
DEATHS: 3
• Texas: 2 – This is 0.31% of all cases
• New Mexico: 1 – This is 1.54% of all cases
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• Mexico – 865 (+58)
‒Chihuahua, Mexico: 844 (+58) cases, 3 hospitalizations, 1 fatality
• Canada: 1531 (+270) (This reflects Ontario's Outbreak, which began 11/24)
‒Ontario, Canada – 1243 (+223) cases, 84 hospitalizations.
• Europe: 6,814
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Non-metals react with oxygen to form non-metallic oxides.
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3. Reaction with Acids
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4. Reaction with Bases
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Displacement Reaction
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Aluminum: Used in aircraft, utensils.
Copper: Electrical wires.
Gold and Silver: Jewelry.
Zinc: Coating iron to prevent rusting (galvanization).
Uses of Non-Metals
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Nitrogen: Fertilizers.
Chlorine: Water purification.
Carbon: Fuel (coal), steel-making (coke).
Iodine: Medicines.
Alloys
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